Themed collection 2017 Green Chemistry Hot Articles
![](https://www.rsc-cdn.org/pubs-core/2022.0.148/content/NewImages/Ajax-GA-Loader.gif)
Bioprivileged molecules: creating value from biomass
Bioprivileged molecules generated from biomass can be converted to both novel molecules and drop-in replacements.
Green Chem., 2017,19, 3177-3185
https://doi.org/10.1039/C7GC00296C
The E factor 25 years on: the rise of green chemistry and sustainability
The global impact of green chemistry and sustainability and the pivotal role of the E factor concept, over the last twenty five years, is reviewed.
Green Chem., 2017,19, 18-43
https://doi.org/10.1039/C6GC02157C
Recent advances in new oxidizers for solid rocket propulsion
Recent progress in the synthesis and modification of green oxidizers and their application in solid rocket propellant formulations during these last few decades are reviewed.
Green Chem., 2017,19, 4711-4736
https://doi.org/10.1039/C7GC01928A
Heterogeneous Diels–Alder catalysis for biomass-derived aromatic compounds
This review highlights Diels–Alder heterogeneous catalysis for the production of biomass-derived aromatic compounds.
Green Chem., 2017,19, 3468-3492
https://doi.org/10.1039/C7GC00992E
Metal–organic frameworks meet scalable and sustainable synthesis
Inspired by recent commercialisation of metal–organic frameworks, this review highlights challenges and recent advances in developing scalable and sustainable metal–organic synthesis.
Green Chem., 2017,19, 2729-2747
https://doi.org/10.1039/C7GC01078H
Intensification studies of heterogeneous catalysts: probing and overcoming catalyst deactivation during liquid phase operation
In addition to high levels of activity and selectivity, promising heterogeneous catalysts must also possess sufficient levels of stability. This tutorial review covers the topic of heterogeneous catalyst deactivation during liquid phase operation.
Green Chem., 2017,19, 2711-2728
https://doi.org/10.1039/C7GC00163K
Practical molecular thermodynamics for greener solution chemistry
To enhance solubility using greener chemistry we should harness sound principles of molecular-based thermodynamics.
Green Chem., 2017,19, 68-75
https://doi.org/10.1039/C6GC03002E
A quest for polycarbonates provided via sustainable epoxide/CO2 copolymerization processes
Bio-derived epoxides and impure sources of carbon dioxide offer exciting resources for renewable polycarbonate production.
Green Chem., 2017,19, 4990-5011
https://doi.org/10.1039/C7GC02560B
Lignin transformations for high value applications: towards targeted modifications using green chemistry
We provide a critical review of green processes enabling the fractionation and/or depolymerization of lignin towards value-added products.
Green Chem., 2017,19, 4200-4233
https://doi.org/10.1039/C7GC01479A
Application of microwave-assisted heterogeneous catalysis in sustainable synthesis design
Recent advances in the application of microwave-assisted heterogeneous catalytic synthesis approaches are reviewed with additional inputs on the energy efficiency and scale-up of microwave-assisted synthesis.
Green Chem., 2017,19, 3729-3751
https://doi.org/10.1039/C7GC01393K
Chemically recyclable polymers: a circular economy approach to sustainability
Developing recyclable polymers provides a solution to materials' end-of-life issues and also an approach to establish a circular materials economy.
Green Chem., 2017,19, 3692-3706
https://doi.org/10.1039/C7GC01496A
Lithium-ion batteries for sustainable energy storage: recent advances towards new cell configurations
Sustainable energy storage may be achieved by using advanced lithium-ion battery configurations with high energy, low cost and environmental compatibility.
Green Chem., 2017,19, 3442-3467
https://doi.org/10.1039/C7GC01328K
Syngas production from electrochemical reduction of CO2: current status and prospective implementation
The opportunities and challenges for exploiting the production of syngas from the electrochemical reduction of CO2 are critically reviewed and analysed.
Green Chem., 2017,19, 2326-2346
https://doi.org/10.1039/C7GC00398F
Biomass-derived solvents as effective media for cross-coupling reactions and C–H functionalization processes
Palladium-catalyzed cross-coupling reactions are indispensable tools in molecular syntheses with numerous applications in academia and for the practitioners in the chemical and pharmaceutical industries.
Green Chem., 2017,19, 1601-1612
https://doi.org/10.1039/C7GC00067G
![Open Access](https://www.rsc-cdn.org/pubs-core/2022.0.148/content/NewImages/open-access-icon-orange.png)
Transaminase biocatalysis: optimization and application
Transaminase biocatalysis shows immense potential in industrial applications, and optimizations of both proteins and processes are of great importance.
Green Chem., 2017,19, 333-360
https://doi.org/10.1039/C6GC02328B
Construction of 2,3-quaternary fused indolines from alkynyl tethered oximes and diaryliodonium salts through a cascade strategy of N-arylation/cycloaddition/[3,3]-rearrangement
An efficient cascade strategy was developed for the synthesis of 2,3-quaternary fused indolines from alkynyl tethered oximes and diaryliodonium salts.
Green Chem., 2017,19, 5761-5766
https://doi.org/10.1039/C7GC02844J
Visible-light-mediated aerobic selenation of (hetero)arenes with diselenides
The first visible-light driven aerobic oxidation for the direct selenation of (hetero)arenes has been developed at room temperature, providing an eco-friendly, atom-economical protocol to prepare unsymmetrical selenides from easily accessible diselenides.
Green Chem., 2017,19, 5559-5563
https://doi.org/10.1039/C7GC02803B
A dual-templating strategy for the scale-up synthesis of dendritic mesoporous silica nanospheres
Mesoporous silica nanoparticles with varied morphologies and pore structures were synthesized on the kilogram scale using cetyltrimethylammonium bromide and an anionic surfactant as co-templates.
Green Chem., 2017,19, 5575-5581
https://doi.org/10.1039/C7GC02139A
Tuneable 3D printed bioreactors for transaminations under continuous-flow
A method to efficiently immobilize enzymes on 3D printed continuous-flow devices is presented.
Green Chem., 2017,19, 5345-5349
https://doi.org/10.1039/C7GC02421E
Scalable and super-stable exfoliation of graphitic carbon nitride in biomass-derived γ-valerolactone: enhanced catalytic activity for the alcoholysis and cycloaddition of epoxides with CO2
γ-Valerolactone could exfoliate bulk g-C3N4 to form a super-stable dispersion of few-layer g-C3N4 nanosheets with a high concentration of 0.8 mg mL−1, showing enhanced activity for non-photocatalytic reactions.
Green Chem., 2017,19, 5041-5045
https://doi.org/10.1039/C7GC02583A
Base-free nickel-catalyzed hydroboration of simple alkenes with bis(pinacolato)diboron in an alcoholic solvent
A base-free nickel-catalyzed hydroboration of unreactive simple alkenes with bis(pinacolato)diboron using methanol as the hydride source under mild conditions has been developed.
Green Chem., 2017,19, 4498-4502
https://doi.org/10.1039/C7GC02282D
Glucose promoted facile reduction of azides to amines under aqueous alkaline conditions
A quick and efficient method for the reduction of azides to amines in water using D-glucose and KOH as green reagents is reported.
Green Chem., 2017,19, 4268-4271
https://doi.org/10.1039/C7GC01593C
Tandem deprotection/coupling for peptide synthesis in water at room temperature
A tandem deprotection/coupling sequence is reported for solution-phase peptide synthesis in water under micellar catalysis conditions using the designer surfactant TPGS-750-M.
Green Chem., 2017,19, 4263-4267
https://doi.org/10.1039/C7GC01575E
Designing the thermal behaviour of aqueous biphasic systems composed of ammonium-based zwitterions
The design of the thermal behaviour – from an upper critical solution temperature (UCST) to a lower critical solution temperature (LCST) – of aqueous biphasic systems composed of water-soluble ammonium-based zwitterions.
Green Chem., 2017,19, 4012-4016
https://doi.org/10.1039/C7GC02262J
An introduction to zwitterionic salts
Zwitterionic salts: highly hydrophilic materials, incorporating some characteristics of zwitterions, ionic liquids, and inorganic salts with potential applications in the biomedical field and separation technology.
Green Chem., 2017,19, 4007-4011
https://doi.org/10.1039/C7GC01523B
Potassium isopropyl xanthate (PIX): an ultra-efficient palladium scavenger
The increasing employment of palladium-catalyzed reactions in the synthesis of active pharmaceutical ingredients (APIs) has created a pressing need for ultra-efficient palladium removal of the resulting metal contaminants.
Green Chem., 2017,19, 4002-4006
https://doi.org/10.1039/C7GC01765K
Atom- and step-economical nucleophilic arylation of azaaromatics via electrochemical oxidative cross C–C coupling reactions
A simple and efficient electrochemical method for the synthesis of asymmetrical bi(het)aryls through direct functionalization of the C(sp2)–H bond in azaaromatics with fragments of (hetero)aromatic nucleophiles has been developed.
Green Chem., 2017,19, 2931-2935
https://doi.org/10.1039/C7GC00789B
Organic sponge photocatalysis
A polydimethylsiloxane organic sponge photocatalyst: high efficiency and reusability for visible light mediated cross-dehydrogenative coupling reactions. Through an easy-to-build continuous flow reactor, the sponge photocatalytic reaction can be facilely scaled up.
Green Chem., 2017,19, 2925-2930
https://doi.org/10.1039/C6GC03558B
Incorporation of carbon dioxide into phthalides via ligand-free copper-catalyzed direct carboxylation of benzoxasiloles
The synthesis of a wide range of phthalides was achieved through a copper-catalyzed carboxylation reaction of benzoxasiloles.
Green Chem., 2017,19, 2501-2505
https://doi.org/10.1039/C7GC00917H
![Open Access](https://www.rsc-cdn.org/pubs-core/2022.0.148/content/NewImages/open-access-icon-orange.png)
Cellulose acetate as a convenient intermediate for the preparation of 5-acetoxymethylfurfural from biomass
A new method for the synthesis of AMF based on the acetolysis of cellulose acetate is reported. Cellulose acetate prepared by wood acetylation can be applied as a precursor, offering possibilities for integrated biomass processing.
Green Chem., 2017,19, 2496-2500
https://doi.org/10.1039/C7GC00975E
![Open Access](https://www.rsc-cdn.org/pubs-core/2022.0.148/content/NewImages/open-access-icon-orange.png)
Organocatalytic valorisation of glycerol via a dual NHC-catalysed telescoped reaction
NHC-catalysis enables the successful functionalisation of glycerol through a telescoped reaction strategy involving carbonation and the subsequent oxidative esterification.
Green Chem., 2017,19, 2477-2481
https://doi.org/10.1039/C7GC00471K
Metal-free intramolecular amino-acyloxylation of 2-aminostyrene with carboxylic acid for the synthesis of 3-acyloxyl indolines in water
A metal-free amino-acyloxylation of 2-aminostyrene was developed for the synthesis of 3-acyloxyl indolines.
Green Chem., 2017,19, 2076-2079
https://doi.org/10.1039/C7GC00212B
Effective separation of aromatic and aliphatic amino acid mixtures using ionic-liquid-based aqueous biphasic systems
Ionic-liquid-based aqueous biphasic systems allow an efficient and selective separation of aliphatic and aromatic amino acid mixtures usually present in protein hydrolysates or fermentation broths.
Green Chem., 2017,19, 1850-1854
https://doi.org/10.1039/C6GC03060B
A copper-catalyzed oxidative coupling reaction of arylboronic acids, amines and carbon dioxide using molecular oxygen as the oxidant
A Cu-catalyzed oxidative coupling reaction of arylboronic acids, amines and carbon dioxide is described, providing a route to O-aryl carbamates.
Green Chem., 2017,19, 1642-1646
https://doi.org/10.1039/C6GC03465A
Continuous flow ring-closing metathesis, an environmentally-friendly route to 2,5-dihydro-1H-pyrrole-3-carboxylates
Ring-closing metathesis, realized in continuous flow using dimethyl carbonate as a solvent, allowed us to convert up to 10 g of dienes into important building blocks.
Green Chem., 2017,19, 1647-1652
https://doi.org/10.1039/C7GC00235A
Highly efficient aqueous phase chemoselective hydrogenation of α,β-unsaturated aldehydes catalysed by phosphine-decorated polymer immobilized IL-stabilized PdNPs
An aqueous phase hydrogenation of α,β-unsaturated aldehydes with remarkable selectivity for the CC double bond under mild conditions.
Green Chem., 2017,19, 1635-1641
https://doi.org/10.1039/C6GC03528K
Cu(I)-Doped carbon quantum dots with zigzag edge structures for highly efficient catalysis of azide–alkyne cycloadditions
Cu(I)-CQDs with zigzag-shaped edges were prepared and used for a highly efficient catalysis of the Huisgen 1,3-dipolar cycloaddition that was made possible owing to their rapid release of Cu(I).
Green Chem., 2017,19, 1494-1498
https://doi.org/10.1039/C6GC03288E
Air-induced double addition of P(O)–H bonds to alkynes: a clean and practical method for the preparation of 1,2-bisphosphorylethanes
An air-induced double addition of diphenyl phosphine oxide to various alkynes is reported.
Green Chem., 2017,19, 1502-1506
https://doi.org/10.1039/C6GC03240K
N2O-Free single-pot conversion of cyclohexane to adipic acid catalysed by an iron(II) scorpionate complex
Iron catalysed efficient single-pot adipic acid synthesis by cyclohexane oxidation with ozone in a solvent-, heating-, radiation- and N2O-free protocol.
Green Chem., 2017,19, 1499-1501
https://doi.org/10.1039/C6GC03208G
![Open Access](https://www.rsc-cdn.org/pubs-core/2022.0.148/content/NewImages/open-access-icon-orange.png)
Towards environmentally acceptable synthesis of chiral α-hydroxy ketones via oxidase-lyase cascades
Product precipitation as well as a smart reaction design was applied for the synthesis of chiral hydroxyketones on preparative scale.
Green Chem., 2017,19, 1226-1229
https://doi.org/10.1039/C7GC00020K
Access to cross-linked chitosans by exploiting CO2 and the double solvent-catalytic effect of ionic liquids
Fist synthesis of ureido cross-linked chitosans employing the CO2–chitosan–ionic liquid three component system as a way to prepare new biomaterials.
Green Chem., 2017,19, 1235-1239
https://doi.org/10.1039/C6GC02935C
Pd/C–Al–water facilitated selective reduction of a broad variety of functional groups
The chemoselective reduction of a broad variety of functional groups by a Pd/C–Al–H2O system is described.
Green Chem., 2017,19, 1230-1234
https://doi.org/10.1039/C6GC03032G
Chlorohydrination of allyl chloride with HCl and H2O2 catalyzed by hollow titanium silicate zeolite to produce dichloropropanol
A novel chlorohydrination process of allyl chloride with HCl and H2O2 catalyzed by hollow titanium silicate zeolite has been developed, overcoming the significant drawbacks of traditional Cl2-based route.
Green Chem., 2017,19, 1221-1225
https://doi.org/10.1039/C6GC03005J
A facile and simple method for synthesis of graphene oxide quantum dots from black carbon
We developed a simple and facile one-pot hydrothermal methods for synthesis of GO-dots without the need to use strong concentrated acid and the entire synthetic process only took 90 min.
Green Chem., 2017,19, 900-904
https://doi.org/10.1039/C6GC03092K
![Open Access](https://www.rsc-cdn.org/pubs-core/2022.0.148/content/NewImages/open-access-icon-orange.png)
Ionic liquids that form adducts with alcohols
Ionic liquids bearing an activated carbonyl group in the cation are shown to form adducts with alcohols without the aid of any catalysts. How these functionalised ionic liquids could be used in altering vapour phase compositions of alcohols and in alcohol separations are demonstrated.
Green Chem., 2017,19, 614-618
https://doi.org/10.1039/C6GC02708C
Biocatalytic transamination with near-stoichiometric inexpensive amine donors mediated by bifunctional mono- and di-amine transaminases
Bifunctional transaminases enable a strategy for the production of chiral amines using small excesses of diamine donors.
Green Chem., 2017,19, 361-366
https://doi.org/10.1039/C6GC02102F
A catalyst-free 1,3-dipolar cycloaddition of C,N-cyclic azomethine imines and 3-nitroindoles: an easy access to five-ring-fused tetrahydroisoquinolines
A catalyst-free 1,3-dipolar cycloaddition of C,N-cyclic azomethine imines and 3-nitroindoles has been reported under mild conditions.
Green Chem., 2017,19, 82-87
https://doi.org/10.1039/C6GC02517J
Ru/ceria-catalyzed direct formylation of amines and CO to produce formamides
We herein report a new strategy of directly converting amines and CO to formamides with 100% atom utilization efficiency.
Green Chem., 2017,19, 88-92
https://doi.org/10.1039/C6GC02603F
Liquid/liquid extraction of biomass-derived lignin from lignocellulosic pretreatments
The extraction of lignin from lignocellulosic pretreatments regards the transfer of lignin from the fractionation solvent to a different medium for valorization.
Green Chem., 2017,19, 93-97
https://doi.org/10.1039/C6GC02270G
A biomimetic photoelectrocatalyst of Co–porphyrin combined with a g-C3N4 nanosheet based on π–π supramolecular interaction for high-efficiency CO2 reduction in water medium
Aiming at high-efficiency biomimetic CO2 reduction, a photoelectrocatalyst with excellent CO2 catalytic activity was designed and prepared by self-assembly immobilizing CoTPP onto g-C3N4 based on π–π interaction.
Green Chem., 2017,19, 5900-5910
https://doi.org/10.1039/C7GC02657A
Crystal lattice distortion in ultrathin Co(OH)2 nanosheets inducing elongated Co–OOH bonds for highly efficient oxygen evolution reaction
The highly efficient OER performance of the ultrathin cobalt hydroxides nanosheets is due to the elongated Co–OOH bonds generated from crystal lattice distortion, which can serve as the efficiently catalytic active sites.
Green Chem., 2017,19, 5809-5817
https://doi.org/10.1039/C7GC02543B
Multistep purification of cytochrome c PEGylated forms using polymer-based aqueous biphasic systems
An efficient process of PEGylation and purification of different site-specific Cyt-c PEGylated forms was developed with high efficiency using polymer-based aqueous biphasic systems.
Green Chem., 2017,19, 5800-5808
https://doi.org/10.1039/C7GC02600E
Phosphorous acid functionalized polyacrylonitrile fibers with a polarity tunable surface micro-environment for one-pot C–C and C–N bond formation reactions
Novel hydrophilic/hydrophobic surface micro-environment modified phosphoric acid-functionalized PANFs are prepared for one-pot C–C and C–N bond formation reactions with high efficiencies and preeminent reusability.
Green Chem., 2017,19, 5818-5830
https://doi.org/10.1039/C7GC02935G
Solvent- and base-free synthesis of wax esters from fatty acid methyl esters by consecutive one-pot, two-step catalysis
Wax esters were produced from fatty acid methyl esters using a catalytic one-pot, two-step sequence under solvent- and base-free conditions.
Green Chem., 2017,19, 5665-5673
https://doi.org/10.1039/C7GC02764H
Direct conversion of bio-ethanol to propylene in high yield over the composite of In2O3 and zeolite beta
The superior propylene yield of the In2O3-beta composite (ca. 50%) for the conversion of ethanol to propylene compared to In2O3 (ca. 32%) is due to the fact that zeolite beta in the composite enhances the conversion of the intermediate of acetone to propylene via an additional pathway.
Green Chem., 2017,19, 5582-5590
https://doi.org/10.1039/C7GC02400B
An efficient Pt nanoparticle–ionic liquid system for the hydrodeoxygenation of bio-derived phenols under mild conditions
Hydrodeoxygenation of bio-derived phenols under mild conditions with platinum nanoparticles in situ synthesized in an ionic liquid.
Green Chem., 2017,19, 5435-5441
https://doi.org/10.1039/C7GC01870C
A highly stable Ru/LaCO3OH catalyst consisting of support-coated Ru nanoparticles in aqueous-phase hydrogenolysis reactions
A hydrothermally stable Ru/LaCO3OH catalyst consisting of Ru nanoparticles partially encapsulated by the support with a strong metal–support interaction is developed.
Green Chem., 2017,19, 5412-5421
https://doi.org/10.1039/C7GC02414B
Zirconocene-catalyzed direct (trans)esterification of acyl acids (esters) and alcohols in a strict 1 : 1 ratio under solvent-free conditions
A highly efficient way for the direct (trans)esterification of acyl acids (esters) and alcohols in a strict 1 : 1 ratio using a zirconocene complex (1, 1 mol%), a strong Lewis acid of good water tolerance, as a catalyst under solvent-free conditions has been developed.
Green Chem., 2017,19, 5396-5402
https://doi.org/10.1039/C7GC02174G
Phloretic acid as an alternative to the phenolation of aliphatic hydroxyls for the elaboration of polybenzoxazine
Phloretic acid: a sustainable building block to promote the solvent-free elaboration of benzoxazine and its polymerization into fully bio-based thermosets.
Green Chem., 2017,19, 5065-5073
https://doi.org/10.1039/C7GC02348K
Efficient eco-clean upgrading of isolated cellulose fibers by polyoxometalate (POM) catalyzed ozonation boosted by enzymes
An extremely selective and effective delignification approach using enzymatically driven ozonation catalyzed by α-Keggin-type heteropolyoxometalates in solvent medium was developed.
Green Chem., 2017,19, 5092-5102
https://doi.org/10.1039/C7GC02218B
Synthesis of nano- and microstructures from proanthocyanidins, tannic acid and epigallocatechin-3-O-gallate for active delivery
Versatile tannin nano- and microstructures have been created via ultrasound treatment and thoroughly characterized for the stimuli responsive delivery of active molecules.
Green Chem., 2017,19, 5074-5091
https://doi.org/10.1039/C7GC02009K
An ionic liquid catalyzed probase method for one-pot synthesis of α,β-unsaturated esters from esters and aldehydes under mild conditions
An ionic liquid catalyzed probase method for unsaturated ester synthesis under mild conditions was reported.
Green Chem., 2017,19, 4838-4848
https://doi.org/10.1039/C7GC02265D
A new selective route towards benzoic acid and derivatives from biomass-derived coumalic acid
The selective production of aromatics from bio-based sources is an area of interest to expand the potential for greener alternatives to petroleum-derived chemicals.
Green Chem., 2017,19, 4879-4888
https://doi.org/10.1039/C7GC02041D
![Open Access](https://www.rsc-cdn.org/pubs-core/2022.0.148/content/NewImages/open-access-icon-orange.png)
Efficient route for the construction of polycyclic systems from bioderived HMF
Efficient one-pot synthesis of tricyclic compounds from biobased 5-hydroxymethylfurfural (HMF) is described using a [4 + 2] cycloaddition reaction.
Green Chem., 2017,19, 4858-4864
https://doi.org/10.1039/C7GC02211E
Carbon dioxide-to-methanol single-pot conversion using a C-scorpionate iron(II) catalyst
The highly efficient eco-friendly synthesis of methanol directly from carbon dioxide and H2 catalysed by the iron(II) scorpionate catalyst [FeCl2{κ3-HC(pz)3}] is reported.
Green Chem., 2017,19, 4811-4815
https://doi.org/10.1039/C7GC01993A
Direct use of humic acid mixtures to construct efficient Zr-containing catalysts for Meerwein–Ponndorf–Verley reactions
Humic acid (HA) mixtures from lignite could be directly used to construct Zr-HAs catalysts for MPV reaction of carboxyl compounds.
Green Chem., 2017,19, 4829-4837
https://doi.org/10.1039/C7GC01925D
A two-phase system for the clean and high yield synthesis of furylmethane derivatives over –SO3H functionalized ionic liquids
A new and effective unique two-phase reaction system for the high yield production of tri(furyl)methane from furfural and furan.
Green Chem., 2017,19, 4804-4810
https://doi.org/10.1039/C7GC01654A
Isosorbide synthesis from cellulose with an efficient and recyclable ruthenium catalyst
A recyclable Ru-based hydrogenation catalyst for the two-step conversion of lignocellulosic substrates into isosorbide.
Green Chem., 2017,19, 4563-4570
https://doi.org/10.1039/C7GC01821E
Environmental sustainability assessment of a new degreasing formulation for the tanning cycle within leather manufacturing
The environmental assessment of the lab-scale preparation of a new lactose derivative-based degreasing formulation, for the leather manufacturing cycle, was performed by using EATOS and LCA methodologies.
Green Chem., 2017,19, 4571-4582
https://doi.org/10.1039/C7GC01900A
Controlling silicone-saccharide interfaces: greening silicones
(Poly)saccharides crosslink silicone boronic acid polymers and stabilize the silicone oil/water interface.
Green Chem., 2017,19, 4373-4379
https://doi.org/10.1039/C7GC02088K
About this collection
Welcome to our online rolling collection of the hottest work published in Green Chemistry. Here we feature all the 2017 Green Chemistry articles highlighted as HOT by the handling editor or our referees. Congratulations to all the authors whose articles are featured.