Jump to main content
Jump to site search


Ruthenium p-cymene complexes with α-diimine ligands as catalytic precursors for the transfer hydrogenation of ethyl levulinate to γ-valerolactone

Author affiliations

Abstract

The ruthenium compounds [(η6-p-cymene)RuCl{κ2N-(HCNR)2}]NO3 (R = 4-C6H4Me, [1]NO3; 4-C6H4OH, [2]NO3; C6H11[double bond, length as m-dash]Cy, [3]NO3; 4-C6H10OH, [4]NO3; tBu, [5]NO3) were prepared in high yields from [(p-cymene)RuCl2]2, AgNO3 and the appropriate α-diimine. Compounds [2]PF6 and [4]PF6 were obtained by a straightforward reaction of [(η6-p-cymene)RuCl(MeCN)0.66]PF6, [6]PF6, with α-diimine, whereas [4]BPh4 was obtained by metathesis between [4]NO3 and NaBPh4. All the ruthenium products were characterized by analytical methods, IR, NMR and UV-Vis spectroscopy; in addition, the structure of [1]NO3 was ascertained by an X-ray diffraction study. Compounds [1–4]NO3, [4]PF6 and [4]BPh4 were investigated as catalytic precursors in the transfer hydrogenation reaction of ethyl levulinate to γ-valerolactone in isopropanol solution under microwave irradiation. [4]BPh4 was revealed to be the best catalytic precursor, affording γ-valerolactone in 62% yield under optimized experimental conditions.

Graphical abstract: Ruthenium p-cymene complexes with α-diimine ligands as catalytic precursors for the transfer hydrogenation of ethyl levulinate to γ-valerolactone

Back to tab navigation

Supplementary files

Publication details

The article was received on 17 Jul 2018, accepted on 18 Sep 2018 and first published on 19 Sep 2018


Article type: Paper
DOI: 10.1039/C8NJ03569E
Citation: New J. Chem., 2018, Advance Article
  •   Request permissions

    Ruthenium p-cymene complexes with α-diimine ligands as catalytic precursors for the transfer hydrogenation of ethyl levulinate to γ-valerolactone

    L. Biancalana, S. Fulignati, C. Antonetti, S. Zacchini, G. Provinciali, G. Pampaloni, A. M. Raspolli Galletti and F. Marchetti, New J. Chem., 2018, Advance Article , DOI: 10.1039/C8NJ03569E

Search articles by author

Spotlight

Advertisements