Mild and Robust Redox-Neutral Pd/C-Catalyzed Lignol β-O-4′ Bond Cleavage Through a Low-Energy-Barrier Pathway
作者:Maxim V. Galkin、Christian Dahlstrand、Joseph S. M. Samec
DOI:10.1002/cssc.201500117
日期:2015.7.8
A Pd/Ccatalyzedredox neutral CO bondcleavage of 2‐aryloxy‐1‐arylethanols has been developed. The reactions are carried out at 80 °C, in air, using a green solvent system to yield the aryl ketones in near quantitative yields. Addition of catalytic amounts of a hydrogen source to the reaction mixture activates the catalyst to proceed through a low energy barrier pathway. Initial studies support a
Rhodium-terpyridine catalyzed redox-neutral depolymerization of lignin in water
作者:Yuxuan Liu、Changzhi Li、Wang Miao、Weijun Tang、Dong Xue、Jianliang Xiao、Tao Zhang、Chao Wang
DOI:10.1039/c9gc03057c
日期:——
ketones and phenols, the catalytic system could also be applied to depolymerize dioxasolv lignin and lignocellulose, affording aromatic ketones as the major monomer products. The (hemi)cellulose components in the lignocellulose sample remain almost intact during lignin depolymerization, providing an example of a “lignin-first” process under mild conditions. Mechanisticstudies suggest that the reaction
water-soluble binuclear Rh complex has been developed. The catalytic system could be successfully applied to the depolymerization of a lignin-like polymer, alkaline lignin, as well as raw lignocellulose samples to produce aromatic ketones, providing a homogeneouscatalytic system for “lignin-first” biorefinery in water. Mechanisticstudies on the model substrate suggest that the reaction proceeds via a metal-catalyzed