Themed collection 2022 Green Chemistry Hot Articles

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Open Access Tutorial Review

Expanding plastics recycling technologies: chemical aspects, technology status and challenges

This paper reviewed the entire life cycle of plastics and options for the management of plastic waste to address barriers to industrial chemical recycling and further provide perceptions on possible opportunities with such materials.

Graphical abstract: Expanding plastics recycling technologies: chemical aspects, technology status and challenges
From the themed collection: 2022 Green Chemistry Hot Articles
Open Access Tutorial Review

Cyrene: a bio-based novel and sustainable solvent for organic synthesis

This review highlights the use of Cyrene as an alternative green solvent in organic synthesis.

Graphical abstract: Cyrene: a bio-based novel and sustainable solvent for organic synthesis
From the themed collection: Green Chemistry Reviews
Tutorial Review

Supramolecular deep eutectic solvents and their applications

Supramolecular Deep Eutectic Solvent (SUPRADES) – another milestone towards Green Chemistry.

Graphical abstract: Supramolecular deep eutectic solvents and their applications
From the themed collection: 2022 Green Chemistry Hot Articles
Tutorial Review

Synthesis of porous poly(ionic liquid)s for chemical CO2 fixation with epoxides

Porous poly(ionic liquid)s, combining the features of porous polymers and ionic moieties resembling the structures and functions of ionic liquids, have exhibited promising potential in CO2 fixation via cycloadditions with epoxides.

Graphical abstract: Synthesis of porous poly(ionic liquid)s for chemical CO2 fixation with epoxides
From the themed collection: 2022 Green Chemistry Hot Articles
Critical Review

Emerging carbon-based quantum dots for sustainable photocatalysis

This review focuses on the applications of emerging carbon-based QD materials (i.e., GQDs, CNQDs, MQDs, and GDQDs) in sustainable photocatalysis.

Graphical abstract: Emerging carbon-based quantum dots for sustainable photocatalysis
From the themed collection: 2023 Green Chemistry Reviews
Critical Review

Synthetic (bio)degradable polymers – when does recycling fail?

Mapping of the thermal, mechanical and (bio)degradation properties of fossil and bio-based polymers. When recycling fails, criteria and scenarios where (bio)degradable polymers are beneficial, for a sustainable development, were critically discussed.

Graphical abstract: Synthetic (bio)degradable polymers – when does recycling fail?
From the themed collection: 2023 Green Chemistry Reviews
Critical Review

Electro-oxidative depolymerization of lignin for production of value-added chemicals

Recent research progress on the electro-oxidative depolymerization of lignin for the production of value-added products has been reviewed, focusing on the catalysts, electrodes, processes, electrocatalytic system and additives.

Graphical abstract: Electro-oxidative depolymerization of lignin for production of value-added chemicals
From the themed collection: 2022 Green Chemistry Hot Articles
Critical Review

Integrated design of an amination process of lignin oxygenated model compounds to synthesize cyclohexylamine: catalyst nanostructure engineering and catalytic conditional strategy

This review summarizes the research progress in the one-pot catalytic amination of lignin oxygenated model compounds to cyclohexylamine, specifically from the catalyst nanostructure engineering and catalytic conditional strategy.

Graphical abstract: Integrated design of an amination process of lignin oxygenated model compounds to synthesize cyclohexylamine: catalyst nanostructure engineering and catalytic conditional strategy
From the themed collection: 2022 Green Chemistry Hot Articles
Critical Review

Hydrodeoxygenation of potential platform chemicals derived from biomass to fuels and chemicals

This review summarizes a variety of catalytic systems to achieve the selective hydrodeoxygenation of potent biomass-derived platform chemicals with a focus on features including catalytic performance, active sites, and mechanism.

Graphical abstract: Hydrodeoxygenation of potential platform chemicals derived from biomass to fuels and chemicals
From the themed collection: 2022 Green Chemistry Hot Articles
Critical Review

Progress in the catalytic reactions of CO2 and epoxides to selectively provide cyclic or polymeric carbonates

This review of the metal- and organo-catalyzed coupling of CO2 and epoxides (oxiranes) to provide selectively cyclic or polymeric carbonates is intended to highlight recent achievements in this area of research.

Graphical abstract: Progress in the catalytic reactions of CO2 and epoxides to selectively provide cyclic or polymeric carbonates
From the themed collection: 2022 Green Chemistry Hot Articles
Critical Review

Biomass-derived 2-methyltetrahydrofuran platform: a focus on precious and non-precious metal-based catalysts for the biorefinery

The existing literature has been summarized and synthesized, providing a new outlook for the preparation of 2-methyltetrahydrofuran from biomass substrates using precious and non-precious metal catalysts.

Graphical abstract: Biomass-derived 2-methyltetrahydrofuran platform: a focus on precious and non-precious metal-based catalysts for the biorefinery
From the themed collection: 2022 Green Chemistry Hot Articles
Critical Review

Making more with less: confinement effects for more sustainable chemical transformations

Confinement effects offer unique opportinuties to facilitate reactions in a way to favor sustainability... in an almost magical way.

Graphical abstract: Making more with less: confinement effects for more sustainable chemical transformations
From the themed collection: 2022 Green Chemistry Hot Articles
Critical Review

Recent advances in biological production of 1,3-propanediol: new routes and engineering strategies

The development of new biological routes for 1,3-propanediol production from diversified substrates using engineered producers, new chassis, and new pathways.

Graphical abstract: Recent advances in biological production of 1,3-propanediol: new routes and engineering strategies
From the themed collection: 2022 Green Chemistry Hot Articles
Open Access Critical Review

Sustainability in peptide chemistry: current synthesis and purification technologies and future challenges

Developing greener synthesis processes is an inescapable necessity to transform the industrial landscape, mainly in the pharmaceutical sector, into a long-term, sustainable reality.

Graphical abstract: Sustainability in peptide chemistry: current synthesis and purification technologies and future challenges
From the themed collection: Green Chemistry Reviews
Communication

Remote C(sp3)–H heteroarylation of N-fluorocarboxamides with quinoxalin-2(1H)-ones under visible-light-induced photocatalyst-free conditions

A photocatalyst-free visible-light-promoted remote C(sp3)–H heteroarylation of N-fluoroamides with quinoxalin-2(1H)-ones was developed. All types of δ-C(sp3)–H bonds in the N-fluoroamides could be site-specific activated through the 1,5-HAT process.

Graphical abstract: Remote C(sp3)–H heteroarylation of N-fluorocarboxamides with quinoxalin-2(1H)-ones under visible-light-induced photocatalyst-free conditions
From the themed collection: 2022 Green Chemistry Hot Articles
Communication

Epoxidation of olefins enabled by an electro-organic system

An integrated organic electrosynthesis system was developed with a phase-separated membrane-electrode assembly strategy, coupling in situ electrochemical H2O2 production and olefin epoxidation, with only H2O and O2 consumption under ambient conditions.

Graphical abstract: Epoxidation of olefins enabled by an electro-organic system
From the themed collection: 2022 Green Chemistry Hot Articles
Communication

Visible-light-induced sulfonylarylation of unactivated alkenes via 1,4-(hetero)aryl migration from oxygen or nitrogen to carbon

A new, metal-free, and highly atom economical strategy for the difunctionalization of unactivated alkenes under mild conditions.

Graphical abstract: Visible-light-induced sulfonylarylation of unactivated alkenes via 1,4-(hetero)aryl migration from oxygen or nitrogen to carbon
From the themed collection: 2022 Green Chemistry Hot Articles
Communication

Antioxidant-induced transformations of a metal-acid hydrocracking catalyst in the deconstruction of polyethylene waste

This work details the effect of common antioxidants on the activity and functionality of a hydrocracking catalyst, along with associated changes to the product distribution in the deconstruction of high-density polyethylene.

Graphical abstract: Antioxidant-induced transformations of a metal-acid hydrocracking catalyst in the deconstruction of polyethylene waste
From the themed collection: 2022 Green Chemistry Hot Articles
Communication

Visible-light-driven regioselective carbocarboxylation of 1,3-dienes with organic halides and CO2

An unprecedented visible-light-driven regioselective carbocarboxylation of 1,3-dienes with CO2 using aryl and alkyl halides under mild conditions is reported herein.

Graphical abstract: Visible-light-driven regioselective carbocarboxylation of 1,3-dienes with organic halides and CO2
From the themed collection: 2022 Green Chemistry Hot Articles
Communication

Difunctionalization of unactivated olefins via selective electrochemical chlorosulfuration or chlorosulfoxidation

We introduced a combination of simple graphite electrodes, mild conditions, and a simple workup procedure for the selective preparation of sulfides or sulfoxides via unactivated olefins and thiophenols through a green electrochemical protocol.

Graphical abstract: Difunctionalization of unactivated olefins via selective electrochemical chlorosulfuration or chlorosulfoxidation
From the themed collection: 2022 Green Chemistry Hot Articles
Communication

Practical synthesis of quinolone drugs via a novel TsCl-mediated domino reaction sequence

A novel TsCl-mediated domino sequence to expeditiously access quinolone-based antibiotics, starting from commercially available chromone-3-carboxaldehydes and amines, was developed under environmentally benign conditions.

Graphical abstract: Practical synthesis of quinolone drugs via a novel TsCl-mediated domino reaction sequence
From the themed collection: 2022 Green Chemistry Hot Articles
Communication

Electrochemical enaminone C–H thiolation/C–N amination cascade for thiazole synthesis and its diastereoselective dearomatization

The electrochemical annulation of enaminones/analogous enamines and thioureas providing 2-aminothiazoles has been realized. Modulating the electrolyte enables the diastereoselective synthesis of 4,5-dialkoxyl thiazolines by dearomatization.

Graphical abstract: Electrochemical enaminone C–H thiolation/C–N amination cascade for thiazole synthesis and its diastereoselective dearomatization
From the themed collection: 2022 Green Chemistry Hot Articles
Communication

Photoinduced synthesis of functionalized oxetanes via diradical-mediated ring contraction

A photochemical ring contraction is reported for the synthesis of oxetanes from dihydrofurans and diazo compounds under catalyst-free conditions.

Graphical abstract: Photoinduced synthesis of functionalized oxetanes via diradical-mediated ring contraction
From the themed collection: 2022 Green Chemistry Hot Articles
Open Access Communication

Near quantitative conversion of xylose into bisfuran

Xylose is converted to a new type of bisfuranic compound in nearly quantitative yield with acetylacetone, through a Zr-catalysed Garcia Gonzalez reaction-based strategy by losing five molecules of water.

Graphical abstract: Near quantitative conversion of xylose into bisfuran
From the themed collection: 2022 Green Chemistry Hot Articles
Communication

Photoinduced cascade cyclization of alkynes with NH4SCN: access to SCN-containing dibenzazepines or dioxodibenzothiazepines

Photoinduced tandem cyclization of alkynes with NH4SCN was developed for the synthesis of various SCN-containing seven-membered N-heterocycles.

Graphical abstract: Photoinduced cascade cyclization of alkynes with NH4SCN: access to SCN-containing dibenzazepines or dioxodibenzothiazepines
From the themed collection: 2022 Green Chemistry Hot Articles
Communication

Deep eutectic solvents meet safe, scalable and sustainable hydrogenations enabled by aluminum powder and Pd/C

The in situ generation of H2 from aluminum powder and water/KOH enabled a general hydrogenation method in cholinium chloride/glycerol deep eutectic solvent under Pd/C catalysis.

Graphical abstract: Deep eutectic solvents meet safe, scalable and sustainable hydrogenations enabled by aluminum powder and Pd/C
From the themed collection: 2022 Green Chemistry Hot Articles
Communication

Chemical recycling of polyhydroxybutyrate and polylactic acid over supported Ru catalysts

As an important step towards circular value-chains for bioplastics, we report a strategy for the direct catalytic processing of two biopolyesters.

Graphical abstract: Chemical recycling of polyhydroxybutyrate and polylactic acid over supported Ru catalysts
From the themed collection: 2022 Green Chemistry Hot Articles
Communication

Organocatalyzed trifunctionalization of alkynyl 1,2-diones for the concise synthesis of acyloxy allylidene malonates and γ-alkylidenebutenolides

Two unprecedented reactions using alkynyl 1,2-diketones and 1,3-dicarbonyls under phosphine catalysis have been achieved, furnishing a range of acyloxy allylidene malonates and γ-alkylidenebutenolides in good yields with high stereoselectivities.

Graphical abstract: Organocatalyzed trifunctionalization of alkynyl 1,2-diones for the concise synthesis of acyloxy allylidene malonates and γ-alkylidenebutenolides
From the themed collection: 2022 Green Chemistry Hot Articles
Communication

From PEF to rPEF: disclosing the potential of deep eutectic solvents in continuous de-/re-polymerization recycling of biobased polyesters

For the first time, the design of a urea : zinc acetate DES for a continuous, eco-friendly and closed-loop approach for recycling poly(ethylene 2,5-furandicarboxylate) (PEF) is communicated to avoid its future accumulation in the environment.

Graphical abstract: From PEF to rPEF: disclosing the potential of deep eutectic solvents in continuous de-/re-polymerization recycling of biobased polyesters
From the themed collection: #RSCPoster Conference
Communication

Transition metal-free selective C–S bond cleavage of Ugi-adducts for rapid preparation of peptidomimetics

Diverse peptidomimetics containing N,O- or N,S-aminals are synthesized via a transition metal-free C–S bond cleavage and subsequent Mannich reaction.

Graphical abstract: Transition metal-free selective C–S bond cleavage of Ugi-adducts for rapid preparation of peptidomimetics
From the themed collection: 2022 Green Chemistry Hot Articles
Communication

HP(O)Ph2/H2O-promoted hydrodefluorination of trifluoromethyl alkenes

An efficient transition-metal-free hydrodefluorination reaction of trifluoromethyl alkenes for accessing gem-difluoroalkenes is developed. It was surprising to find that the phosphoryl anion is able to mediate the defluorination.

Graphical abstract: HP(O)Ph2/H2O-promoted hydrodefluorination of trifluoromethyl alkenes
From the themed collection: 2022 Green Chemistry Hot Articles
Communication

Thermoneutral synthesis of spiro-1,4-cyclohexadienes by visible-light-driven dearomatization of benzylmalonates

No preactivation or coupling to high-energy reagents is required for the dearomative coupling of benzylmalonates and acetylenes, although the transformation has no significant thermodynamic driving force.

Graphical abstract: Thermoneutral synthesis of spiro-1,4-cyclohexadienes by visible-light-driven dearomatization of benzylmalonates
From the themed collection: 2022 Green Chemistry Hot Articles
Open Access Communication

Synthesis of 2,5-furandicarboxylic acid dimethyl ester from galactaric acid via dimethyl carbonate chemistry

A simple procedure for the one-pot synthesis of 2,5-furandicarboxylic acid dimethyl ester (FDME) from galactaric (mucic) acid via dimethyl carbonate (DMC) chemistry is presented. The compound was isolated as a white powder in 70% yield.

Graphical abstract: Synthesis of 2,5-furandicarboxylic acid dimethyl ester from galactaric acid via dimethyl carbonate chemistry
From the themed collection: 2022 Green Chemistry Hot Articles
Communication

Boosting CO2 electroreduction to C2+ products on fluorine-doped copper

CO2 could be efficiently converted into C2+ products over a fluorine doped Cu catalyst, with high faradaic efficiency (70.4%) and current density (above 400 mA cm−2), which benefited from the boost the adsorption of CO intermediate.

Graphical abstract: Boosting CO2 electroreduction to C2+ products on fluorine-doped copper
From the themed collection: 2022 Green Chemistry Hot Articles
Communication

Synthesis of carboxylic acids via the hydrocarboxylation of alcohols with CO2 and H2

Alcohols with different chain lengths can react with CO2 and H2 to produce C1-elongated carboxylic acids using an Ir catalyst.

Graphical abstract: Synthesis of carboxylic acids via the hydrocarboxylation of alcohols with CO2 and H2
From the themed collection: 2022 Green Chemistry Hot Articles
Communication

Electrochemical-induced benzyl C–H amination towards the synthesis of isoindolinones via aroyloxy radical-mediated C–H activation

A novel electrochemical strategy for the synthesis of valuable isoindolinones has been developed with the use of simple o-alkylbenzoic acid and alkyl nitrile as starting materials under metal-catalyst and external oxidant-free conditions.

Graphical abstract: Electrochemical-induced benzyl C–H amination towards the synthesis of isoindolinones via aroyloxy radical-mediated C–H activation
From the themed collection: 2022 Green Chemistry Hot Articles
Communication

Tuning the efficiency and product composition for electrocatalytic CO2 reduction to syngas over zinc films by morphology and wettability

The regulation of morphology and wettability of Zn films is an efficient strategy for producing syngas with a wide CO/H2 ratio range from electrochemical CO2 and H2O reduction.

Graphical abstract: Tuning the efficiency and product composition for electrocatalytic CO2 reduction to syngas over zinc films by morphology and wettability
From the themed collection: 2022 Green Chemistry Hot Articles
Communication

Boosting nitrate electroreduction to ammonia on NbOxvia constructing oxygen vacancies

A NbOx catalyst with oxygen vacancies is synthesized and used for nitrate electroreduction to ammonia. The faradaic efficiency of 94.5% and the NH3 formation rate of 55.0 μg h−1 mgcat−1 can be achieved in a neutral electrolyte.

Graphical abstract: Boosting nitrate electroreduction to ammonia on NbOxvia constructing oxygen vacancies
From the themed collection: 2022 Green Chemistry Hot Articles
Paper

Organophotocatalytic silyl transfer of silylboranes enabled by methanol association: a versatile strategy for C–Si bond construction

A visible light-induced organophotocatalytic silyl transfer strategy of silylboranes for the construction of C–Si bonds has been demonstrated, where methanol association with boron atoms enables the photocatalytic generation of silyl radicals.

Graphical abstract: Organophotocatalytic silyl transfer of silylboranes enabled by methanol association: a versatile strategy for C–Si bond construction
From the themed collection: 2022 Green Chemistry Hot Articles
Paper

Guiding research in electrochemical CO2 conversion strategies through a systems-level perspective

Life cycle assessment as a decision-making tool in R&D of CO2 conversion technologies. A set of technologies are explored to provide recommendations regarding potential climate impacts. Relevant fundamentals of this type of assessment are provided.

Graphical abstract: Guiding research in electrochemical CO2 conversion strategies through a systems-level perspective
Open Access Paper

High yield production of 1,4-cyclohexanediol and 1,4-cyclohexanediamine from high molecular-weight lignin oil

we present a highly efficient catalytic strategies which are capable of converting DMBQ obtainable from high molecular-weight lignin-oil into industrially highly relevant and well-defined 1,4-cyclohexanediol and 1,4-cyclohexanediamine.

Graphical abstract: High yield production of 1,4-cyclohexanediol and 1,4-cyclohexanediamine from high molecular-weight lignin oil
Paper

N-Haloimide-enabled halogenation via halogen-bond-assisted C–C activation of alkanols

The halogen-bond-assisted C–C activation of alkanols to synthesize a library of alkyl halides in the absence of catalysts and oxidants is disclosed, wherein inexpensive N-haloimides were explored as bifunctional reagents.

Graphical abstract: N-Haloimide-enabled halogenation via halogen-bond-assisted C–C activation of alkanols
From the themed collection: 2022 Green Chemistry Hot Articles
Paper

New insights into urethane alcoholysis enable chemical full recycling of blended fabric waste

New insights into amide-esterification during urethane alcoholysis are presented, and they enable chemical-full-recycling of blended fabric waste.

Graphical abstract: New insights into urethane alcoholysis enable chemical full recycling of blended fabric waste
From the themed collection: 2022 Green Chemistry Hot Articles
Paper

An enhanced strategy based on the pyrolysis of bean dregs for efficient selective recovery of lithium from spent lithium-ion batteries

Bean dregs were exploited as a green reducing agent, and adopted an enhanced recycling process combining biomass reduction roasting and carbonated water leaching to efficiently and selectively recover Li from the spent LIBs.

Graphical abstract: An enhanced strategy based on the pyrolysis of bean dregs for efficient selective recovery of lithium from spent lithium-ion batteries
From the themed collection: 2022 Green Chemistry Hot Articles
Paper

Bi-functional ionic liquids facilitate liquid-phase exfoliation of porphyrin-based covalent organic frameworks in water for highly efficient CO2 photoreduction

A green, high yield and scalable strategy to exfoliate covalent organic framework powders using bi-functional ionic liquids in water was developed under ambient conditions.

Graphical abstract: Bi-functional ionic liquids facilitate liquid-phase exfoliation of porphyrin-based covalent organic frameworks in water for highly efficient CO2 photoreduction
From the themed collection: 2022 Green Chemistry Hot Articles
Open Access Paper

Cyclohexanone ammoximation via in situ H2O2 production using TS-1 supported catalysts

The in situ synthesis of H2O2 offers an attractive alternative to the current industrial route to cyclohexanone oxime, a major precursor to Nylon-6.

Graphical abstract: Cyclohexanone ammoximation via in situ H2O2 production using TS-1 supported catalysts
From the themed collection: 2022 Green Chemistry Hot Articles
Paper

Valorisation of wine wastes by de novo biosynthesis of resveratrol using a recombinant xylose-consuming industrial Saccharomyces cerevisiae strain

A recombinant S. cerevisiae strain was engineered to produce resveratrol from many carbon sources, including xylose, which was used for the synthesis of resveratrol from different wine wastes like vine pruning residue, grape must and wine lees.

Graphical abstract: Valorisation of wine wastes by de novo biosynthesis of resveratrol using a recombinant xylose-consuming industrial Saccharomyces cerevisiae strain
From the themed collection: 2022 Green Chemistry Hot Articles
Open Access Paper

High performance, but low cost and environmental impact? Integrated techno-economic and life cycle assessment of polyoxazolidinone as a novel high-performance polymer

Life Cycle Assessment (LCA) and Techno-economic Assessment (TEA) are crucial for a comprehensive evaluation of the novel high-performance thermoplastic polymer polyoxazolidinone (POX).

Graphical abstract: High performance, but low cost and environmental impact? Integrated techno-economic and life cycle assessment of polyoxazolidinone as a novel high-performance polymer
From the themed collection: 2022 Green Chemistry Hot Articles
Paper

Catalytic production of tetrahydropyran (THP): a biomass-derived, economically competitive solvent with demonstrated use in plastic dissolution

Tetrahydropyran (THP) is a five-carbon heterocyclic ether that is non-carcinogenic, non-peroxide forming, biodegradable, and economically competitive with tetrahydrofuran (THF) as a solvent.

Graphical abstract: Catalytic production of tetrahydropyran (THP): a biomass-derived, economically competitive solvent with demonstrated use in plastic dissolution
From the themed collection: 2022 Green Chemistry Hot Articles
Open Access Paper

Hydrogels with protective effects against cellular oxidative stress via enzymatic crosslinking of feruloylated arabinoxylan from corn fibre

Corn fibre agricultural side streams can be upgraded into radical scavenging hydrogels with protective effects against cellular oxidative stress using mild biocatalytical processes.

Graphical abstract: Hydrogels with protective effects against cellular oxidative stress via enzymatic crosslinking of feruloylated arabinoxylan from corn fibre
From the themed collection: 2022 Green Chemistry Hot Articles
Open Access Paper

Valorisation of phenols to coumarins through one-pot palladium-catalysed double C–H functionalizations

Herein a one-pot double C–H functionalization for constructing C8-alkyl substituted coumarins from phenols is reported. For the first time Pd/C as heterogenous catalyst was used to enable the synthesis of structurally divers coumarins.

Graphical abstract: Valorisation of phenols to coumarins through one-pot palladium-catalysed double C–H functionalizations
From the themed collection: 2022 Green Chemistry Hot Articles
Paper

Preparation of battery-grade lithium carbonate by microbubble enhanced CO2 gas–liquid reactive crystallization

A microbubble enhanced CO2 gas–liquid reactive crystallization process for the one-step preparation of battery-grade Li2CO3 has been proposed. The LiFePO4 cathode synthesized from battery-grade Li2CO3 exhibits a remarkable specific capacity.

Graphical abstract: Preparation of battery-grade lithium carbonate by microbubble enhanced CO2 gas–liquid reactive crystallization
From the themed collection: 2022 Green Chemistry Hot Articles
Open Access Paper

Risk for the release of an enormous amount of nanoplastics and microplastics from partially biodegradable polymer blends

Non-biodegradable polymers are released as microplastics into the environments during the biodegradation of partially biodegradable polymer blends.

Graphical abstract: Risk for the release of an enormous amount of nanoplastics and microplastics from partially biodegradable polymer blends
From the themed collection: 2022 Green Chemistry Hot Articles
Open Access Paper

Lignin alkaline oxidation using reversibly-soluble bases

When excess base is required to drive desired reactions, such as in lignin alkaline oxidation, Sr(OH)2 can offer a reversibly-soluble alternative to NaOH that allows simple recycle of the excess base with concomitant cost and environmental benefits.

Graphical abstract: Lignin alkaline oxidation using reversibly-soluble bases
From the themed collection: 2022 Green Chemistry Hot Articles
Open Access Paper

Antioxidant silicone oils from natural antioxidants

Natural antioxidants, such as vitamin E and eugenol, once grafted to silicone oils maintain their antioxidant activity and dilute the quantity of silicone needed for a given application.

Graphical abstract: Antioxidant silicone oils from natural antioxidants
Paper

1,2,3,5-Tetrakis(carbazol-9-yl)-4,6-dicyanobenzene (4CzIPN)-based porous organic polymers for visible-light-driven organic transformations in water under aerobic oxidation

A series of hyper-crosslinked POPs were constructed by Friedel–Crafts alkylation reaction of 4CzIPN with FDA, which contains a certain quantity of hydrophilic ether residues to facilitate visible-light-promoted aqueous organic transformations.

Graphical abstract: 1,2,3,5-Tetrakis(carbazol-9-yl)-4,6-dicyanobenzene (4CzIPN)-based porous organic polymers for visible-light-driven organic transformations in water under aerobic oxidation
From the themed collection: 2022 Green Chemistry Hot Articles
Paper

A chemical approach for the future of PLA upcycling: from plastic wastes to new 3D printing materials

Chemical upcycling of PLA:  Ethanolamine cleaves polylactic acid to high purity N-LEA. N-LEA reacts with methacrylic anhydride (MAh) yielding crosslinkable DME. Simply combine DME with reactive diluent and photo-initiator to form a 3D printing resin.

Graphical abstract: A chemical approach for the future of PLA upcycling: from plastic wastes to new 3D printing materials
From the themed collection: 2022 Green Chemistry Hot Articles
Paper

Production of glucose-galactose syrup and milk minerals from Greek yogurt acid whey

A techno-economic analysis and life cycle assessment for the process to produce a sweetener and calcium supplement from Greek yogurt acid whey show that this method has high profitability and a lower environmental footprint than other sweeteners.

Graphical abstract: Production of glucose-galactose syrup and milk minerals from Greek yogurt acid whey
From the themed collection: 2022 Green Chemistry Hot Articles
Paper

Electrochemical Minisci reaction via HAT-driven α-C(sp3)–H functionalization of alcohols

An electrochemical Minisci reaction involving HAT driven α-C(sp3)–H functionalization of alcohols was achieved. Both primary and secondary alcohols are applicable to provide 3-hydroxyalkylquinoxalin-2(1H)-ones in good yields.

Graphical abstract: Electrochemical Minisci reaction via HAT-driven α-C(sp3)–H functionalization of alcohols
From the themed collection: 2022 Green Chemistry Hot Articles
Paper

Synthesis of dihydroindazolo[2,3-f]phenanthridin-5(6H)-ones via Rh(III)-catalyzed C–H activation of 2-aryl indazoles and annulation with iodonium ylides

The Rh(III)-catalyzed annulation of 3-arylindazoles with iodonium ylides gave indazole fused dihydrophenanthridinones in excellent yields under mild conditions. The reaction only requires simple work-up procedures, and the catalyst can be recycled.

Graphical abstract: Synthesis of dihydroindazolo[2,3-f]phenanthridin-5(6H)-ones via Rh(iii)-catalyzed C–H activation of 2-aryl indazoles and annulation with iodonium ylides
From the themed collection: 2022 Green Chemistry Hot Articles
Paper

A natural deep eutectic solvent-based aqueous biphasic system coupled with MoS2 photocatalytic reduction for green recovery of gold from thiosulfate solution

Aqueous two-phase system (ATPS) extraction combined with a natural deep eutectic solvent (NADES) is an environmentally friendly separation process.

Graphical abstract: A natural deep eutectic solvent-based aqueous biphasic system coupled with MoS2 photocatalytic reduction for green recovery of gold from thiosulfate solution
From the themed collection: 2022 Green Chemistry Hot Articles
Open Access Paper

Base-selective access to highly functionalized heterocycles from multicomponent Ugi adducts

Selection of the appropriate base in Ugi/post-condensation sequences allows the selective syntheses of different ring-size functionalized lactams.

Graphical abstract: Base-selective access to highly functionalized heterocycles from multicomponent Ugi adducts
From the themed collection: 2022 Green Chemistry Hot Articles
Paper

Photo-driven metal-free multicomponent reaction between aldehydes, anilines and 4-substituted-DHPs for the synthesis of secondary amines

A photocatalyst- and transition-metal-free multicomponent reaction of readily available aldehydes, primary amines and 4-alkyl-1,4-dihydropyridines for the synthesis of secondary amines under visible light irradiation has been accomplished.

Graphical abstract: Photo-driven metal-free multicomponent reaction between aldehydes, anilines and 4-substituted-DHPs for the synthesis of secondary amines
From the themed collection: 2022 Green Chemistry Hot Articles
Open Access Paper

Anodic generation of hydrogen peroxide in continuous flow

The study underscores the development of an efficient electrochemical process for anodic H2O2 production in continuous flow by investigating electrochemical cell setup, electrolyte flow type and rate, as well as electrolyte composition.

Graphical abstract: Anodic generation of hydrogen peroxide in continuous flow
From the themed collection: 2022 Green Chemistry Hot Articles
Paper

Hydroxylation and dimerization of para-dihydroxylated aromatic compounds mediated by cold atmospheric-pressure plasma in comparison with chemically catalyzed reactions

Physical plasma as novel possibility for the synthesis of organic substances e.g. hydroxylated dimers.

Graphical abstract: Hydroxylation and dimerization of para-dihydroxylated aromatic compounds mediated by cold atmospheric-pressure plasma in comparison with chemically catalyzed reactions
From the themed collection: 2022 Green Chemistry Hot Articles
Paper

Are deep eutectic solvents really green?: A life-cycle perspective

Life-cycle assessment of choline chloride/urea (reline) deep eutectic solvent compared with conventional organic solvents.

Graphical abstract: Are deep eutectic solvents really green?: A life-cycle perspective
From the themed collection: 2022 Green Chemistry Hot Articles
Paper

Photocatalytic dehydrogenated etherification of 2-aryl benzylic alcohols

Here we describe an efficient and practical method for the conversion of 2-aryl benzylic alcohols into the corresponding chromenes with the synergistic interactions of 2-bromoanthraquinone, O2nBu4NBr and K2CO3 under visible-light irradiation.

Graphical abstract: Photocatalytic dehydrogenated etherification of 2-aryl benzylic alcohols
From the themed collection: 2022 Green Chemistry Hot Articles
Paper

Green chemical pathway of plasma synthesis of ammonia from nitrogen and water: a comparative kinetic study with a N2/H2 system

This work demonstrates alternative green ammonia processing using nitrogen and water based non-thermal plasma without pure hydrogen supply which results in an enormous amount of CO2 emission.

Graphical abstract: Green chemical pathway of plasma synthesis of ammonia from nitrogen and water: a comparative kinetic study with a N2/H2 system
From the themed collection: 2022 Green Chemistry Hot Articles
Paper

Start from the source: direct treatment of a degraded LiFePO4 cathode for efficient recycling of spent lithium-ion batteries

The flow process of recycling a degraded LiFePO4 cathode.

Graphical abstract: Start from the source: direct treatment of a degraded LiFePO4 cathode for efficient recycling of spent lithium-ion batteries
From the themed collection: 2022 Green Chemistry Hot Articles
Paper

Redox-neutral ketyl radical coupling/cyclization of carbonyls with N-aryl acrylamides through consecutive photoinduced electron transfer

Redox-neutral ketyl couplings: a metal- and additive-free ConPET photocatalytic system allows highly efficient coupling/cyclization of N-aryl acrylamides and carbonyls with formal 100% atom economy.

Graphical abstract: Redox-neutral ketyl radical coupling/cyclization of carbonyls with N-aryl acrylamides through consecutive photoinduced electron transfer
From the themed collection: 2022 Green Chemistry Hot Articles
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Welcome to our online rolling collection of the hottest work published in Green Chemistry. Here we feature all of the 2022 articles highlighted as HOT by our Editors and Referees. Congratulations to all those featured!

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