Ruthenium-8-quinolinethiolate-phenylterpyridine versus ruthenium-bipyridine-phenyl-terpyridine complexes as homogeneous water and high temperature stable hydrogenation catalysts for biomass-derived substrates
摘要:
[(4'-Ph-terpy)(bipy)Ru(L)](OTf)(n) and [(4'-Ph-terpy)(quS)Ru(L)](OTf)(n) (n = 0 or 1 depending on the charge of L, L = labile ligand, e.g., H2O, CH3CN or OTf, bipy = 2,2'-bipyridine, quS = quinoline-8-thiolate) have been evaluated as catalysts for the hydrogenation of the biomass-derivable C6-substrates 2,5-dimethylfuran (obtainable from 5-hydroxymethylfurfural) and 2,5-hexanedione (the hydrolysis product of 2,5-dimethylfuran). Operating in aqueous acidic medium at T = 175-225 degrees C the bipy complex is only marginally active, while the quinoline-8-thiolate complex realizes yields of hydrogenated products up to 97% starting from 2,5-hexanedione and up to 66% starting from 2,5-dimethylfuran. The catalyst can also convert the 5-HMF derived acetone 4-(5-methyl-2-furanyl)-3-buten-2-one into 2,5,8-nonatriol, a potentially valuable cross-linker for polymer formulations. On the basis of DFT calculations, the higher activity of the quinoline-8-thiolate complex is proposed to be rooted in a metal-ligand bifunctional mechanism for the heterolytic activation and transfer of dihydrogen to the carbonyl substrate with the hydride-thiol complex [(4'-Ph-terpy)(quSH)Ru(H)r as the active catalyst. (C) 2015 Elsevier Ltd. All rights reserved.
[EN] COMPOUNDS AND METHODS FOR THE PRODUCTION OF LONG CHAIN HYDROCARBONS FROM BIOLOGICAL SOURCES<br/>[FR] COMPOSÉS ET PROCÉDÉS DE PRODUCTION D'HYDROCARBURES À CHAÎNE LONGUE À PARTIR DE SOURCES BIOLOGIQUES
申请人:LOS ALAMOS NAT SECURITY LLC
公开号:WO2013040311A1
公开(公告)日:2013-03-21
The present invention is directed to the preparation of oxygenated, unsaturated hydrocarbon compounds, such as derivatives of furfural or hydroxymethyl furfural produced by aldol condensation with a ketone or a ketoester, as well as methods of deoxidatively reducing those compounds with hydrogen under acidic conditions to provide saturated hydrocarbons useful as fuels.
The hydrodeoxygenation of bioderived furans into alkanes
作者:Andrew D. Sutton、Fraser D. Waldie、Ruilian Wu、Marcel Schlaf、Louis A. ‘Pete’ Silks、John C. Gordon
DOI:10.1038/nchem.1609
日期:2013.5
The conversion of biomass into fuels and chemical feedstocks is one part of a drive to reduce the world's dependence on crude oil. For transportation fuels in particular, wholesale replacement of a fuel is logistically problematic, not least because of the infrastructure that is already in place. Here, we describe the catalytic defunctionalization of a series of biomass-derived molecules to provide linear alkanes suitable for use as transportation fuels. These biomass-derived molecules contain a variety of functional groups, including olefins, furan rings and carbonyl groups. We describe the removal of these in either a stepwise process or a one-pot process using common reagents and catalysts under mild reaction conditions to provide n-alkanes in good yields and with high selectivities. Our general synthetic approach is applicable to a range of precursors with different carbon content (chain length). This allows the selective generation of linear alkanes with carbon chain lengths between eight and sixteen carbons. The development of methodology to convert biomass into fuels and chemical feedstocks is part of a drive to reduce the world's dependence on crude oil. Here, the catalytic defunctionalization of a series of biomass-derived molecules is described, which allows the selective generation of alkanes with carbon chain lengths between eight and sixteen for use as transportation fuels.
Towards Improved Biorefinery Technologies: 5‐Methylfurfural as a Versatile C
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Platform for Biofuels Development
作者:Konstantin I. Galkin、Valentine P. Ananikov
DOI:10.1002/cssc.201802126
日期:2019.1.10
Low chemical stability and high oxygen content limit utilization of the bio‐based platform chemical 5‐(hydroxymethyl)furfural (HMF) in biofuels development. In this work, Lewis‐acid‐catalyzed conversion of renewable 6‐deoxy sugars leading to formation of more stable 5‐methylfurfural (MF) is carried out with high selectivity. Besides its higher stability, MF is a deoxygenated analogue of HMF with increased