通过两步解聚过程,已经生成并从有机溶剂木质素中分离出功能化的酚醛单体。DDQ / t BuONO / O 2系统促进的β-O-4键的化学选择性催化氧化在模型化合物(包括聚合物模型)和实际木质素中实现。与锌反应后,氧化的β-O-4键断裂。与许多现有方法相比,可以在一锅中完成的该方案具有很高的选择性,从而生成了一种简单的产物混合物,可以轻松地纯化这些产物以得到纯净的化合物。这些产品中提供的功能使其成为潜在的有价值的构建基块。
Stepwise degradation of hydroxyl compounds to aldehydes <i>via</i> successive C–C bond cleavage
作者:Mingyang Liu、Zhanrong Zhang、Xiaojun Shen、Huizhen Liu、Pei Zhang、Bingfeng Chen、Buxing Han
DOI:10.1039/c8cc09504c
日期:——
Stepwise degradation of hydroxyl compounds to aldehydes via successive cleavage of C–C bonds was achieved by using a bimetallic catalytic system (PdCl2 + CuCl) without any ligands and additives. The broad applicability is expanded to a diverse range of aromatic, aliphatic, primary and secondary alcohols, as well as lignin model compounds.
Sequential Cleavage of Lignin Systems by Nitrogen Monoxide and Hydrazine
作者:Laura Elena Hofmann、Dagmar Hofmann、Lea Prusko、Lisa‐Marie Altmann、Markus R. Heinrich
DOI:10.1002/adsc.201901641
日期:2020.4.8
been achieved in a metal‐free two‐step sequence first employing nitrogen monoxide for oxidation followed by hydrazine for reductiveC−Obond scission. In combining nitrogen monoxide and lignin, the newly developed valorization strategy shows the particular feature of starting from two waste materials, and it further exploits the attractive conditions of a Wolff‐Kishner reduction for C−Obond cleavage
[EN] DEPOLYMERISATION OF OXIDISED LIGNIN<br/>[FR] DÉPOLYMÉRISATION D'UNE LIGNINE OXYDÉE
申请人:UNIV ST ANDREWS
公开号:WO2016027091A1
公开(公告)日:2016-02-25
A method of depolymerising a lignin includes oxidising the lignin to provide an oxidised lignin wherein benzylic –OH of β-O-4 linkages have been converted to carbonyl. The oxidised lignin is depolymerised with a metal selected from the group consisting of zinc, magnesium, aluminium and titanium or mixtures thereof, in the presence of an ammonium salt or carbon dioxide. Also described are methods for manufacturing phenolic products from lignin and a method for the cleavage of a β-O-4 linkage in a substrate.
申请人:UNIVERISTY COURT OF THE UNIVERSITY OF ST ANDREWS
公开号:US10407355B2
公开(公告)日:2019-09-10
A method of depolymerizing a lignin includes oxidizing the lignin to provide an oxidized lignin wherein benzylic —OH of β-O-4 linkages have been converted to carbonyl. The oxidized lignin is depolymerized with a metal selected from the group consisting of zinc, magnesium, aluminum and titanium or mixtures thereof, in the presence of an ammonium salt or carbon dioxide. Also described are methods for manufacturing phenolic products from lignin and a method for the cleavage of a β-O-4 linkage in a substrate.