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The base‐free transfer hydrogenation of biomass derived furanic aldehydes with ruthenium and iridium pincer complexes was studied using bio‐alcohols as the hydrogen source. The furanic substrates, such as 5‐hydroxymethyl furfural (HMF) and thiophene‐2‐carboxaldehyde (TC), were reduced under mild conditions (35–80 °C) affording the desired alcohols with excellent conversions and yields. It was also possible to extend this methodology for the transfer hydrogenation of 5‐formylfurfural (DFF) at 130 °C. Deuterium labelling of C−H functions in the furanic alcohols was also investigated in the presence of ethanol‐d6. Finally, proposed catalytic resting species derived from the interactions between one of the catalysts and furanic reagents/product as well as the solvent during the transfer hydrogenation (TH) reaction were analysed. [ABSTRACT FROM AUTHOR]

Keywords: bioalcohols; furanics; green chemistry; transfer hydrogenation EN bioalcohols furanics green chemistry transfer hydrogenation 1 1 1 01/27/23 20230120 NES 230120 B The Front Cover b shows the schematic diagram of converting bio-based furanic alcohols using transfer hydrogentaion. Front Cover: Catalytic Base-Free Transfer Hydrogenation of Biomass Derived Furanic Aldehydes with Bioalcohols and PNP Pincer Complexes (ChemCatChem 2/2023) In their Research Article, R. Padilla, M. Nielsen and co-workers disclose the catalytic performance of different pincer complexes for the base-free transfer hydrogenation (TH) of bio-based furanic aldehydes in presence of EtOH, iPrOH or MeOH as hydrogen sources and solvents under mild reaction conditions. [Extracted from the article]