Tandem Catalytic Depolymerization of Lignin by Water-Tolerant Lewis Acids and Rhodium Complexes
作者:Robin Jastrzebski、Sandra Constant、Christopher S. Lancefield、Nicholas J. Westwood、Bert M. Weckhuysen、Pieter C. A. Bruijnincx
DOI:10.1002/cssc.201600683
日期:2016.8.23
Lignin is an attractive renewable feedstock for aromatic bulk and fine chemicals production, provided that suitable depolymerization procedures are developed. Here, we describe a tandem catalysis strategy for ether linkage cleavage within lignin, involving ether hydrolysis by water‐tolerant Lewis acids followed by aldehyde decarbonylation by a Rh complex. In situ decarbonylation of the reactive aldehydes
木质素是一种有吸引力的可再生原料,只要开发了合适的解聚程序即可用于芳烃原料和精细化学品的生产。在这里,我们描述了木质素中醚键裂解的串联催化策略,包括通过耐水路易斯酸进行醚水解,然后通过Rh络合物进行醛脱羰。反应性醛的原位脱羰可限制单体因再缩合而损失,这是酸催化木质素解聚的主要问题。使用木质素模型化合物使水解和脱羰的速率相匹配,从而使该方法成功应用于软木,硬木和草本二恶草索木质素以及白杨木屑,得到了预期的脱羰产物,而且令人惊讶的是,4-(1 -丙烯基)酚。很有希望