Enzymatic and hydrolytic degradation of benzylaryl ethers related to hardwood lignins
作者:David Ciaramitaro、Cornelius Steelink
DOI:10.1016/0031-9422(75)85126-0
日期:1975.2
their acetates were synthesized as models for hardwood lignin and used as substrates in acid hydrolysis and enzymatic oxidation reactions. Under hydrolytic conditions, the acetates underwent ether cleavage at a slower rate than the free phenols. Evidence for carbonium ion intermediates is presented. Cleavage of the ether substrates by peroxidase—peroxide oxidation was much faster than by acid hydrolysis
摘要 合成了许多 4-羟基苄基苯基醚及其乙酸酯作为硬木木质素的模型,并用作酸水解和酶促氧化反应的底物。在水解条件下,乙酸酯以比游离酚更慢的速率进行醚裂解。提供了碳正离子中间体的证据。过氧化物酶对醚底物的裂解——除不反应的乙酸盐外,所有底物的过氧化物氧化比酸水解快得多。醚底物的组成部分的后续氧化是选择性的:丁香基部分优先于愈创木酰基部分被氧化。氧化反应的电子自旋共振研究表明,去除酚氢原子是第一步,然后是醌-甲基化物形成。