Two-Step, Catalytic C–C Bond Oxidative Cleavage Process Converts Lignin Models and Extracts to Aromatic Acids
作者:Min Wang、Jianmin Lu、Xiaochen Zhang、Lihua Li、Hongji Li、Nengchao Luo、Feng Wang
DOI:10.1021/acscatal.6b02049
日期:2016.9.2
report a two-step strategy for oxidative cleavage of lignin C–C bond to aromatic acids and phenols with molecular oxygen as oxidant. In the first step, lignin β-O-4 alcohol was oxidized to β-O-4 ketone over a VOSO4/TEMPO [(2,2,6,6-tetramethylpiperidin-1-yl)oxyl)] catalyst. In the second step, the C–C bond of β-O-4 linkages was selectively cleaved to acids and phenols by oxidation over a Cu/1,10-phenanthroline
我们在此报告了用分子氧作为氧化剂将木质素C–C键与芳族酸和酚进行氧化裂解的两步策略。第一步,在VOSO 4 / TEMPO [(2,2,6,6-四甲基哌啶-1-基)氧基]催化剂上将木质素β-O-4醇氧化为β-O-4酮。在第二步中,通过在Cu / 1,10-菲咯啉催化剂上进行氧化,将β-O-4键的C–C键选择性地裂解为酸和酚。计算的调查建议的铜-氧代桥联二聚体是为选自C夺氢催化活性位点β -H键,其是为C-C键断裂的速率决定步骤。