Trapping of Reactive Intermediates to Study Reaction Mechanisms in Cellulose Chemistry
Trapping of Reactive Intermediates to Study Reaction Mechanisms in Cellulose Chemistry
复制标题
捕获反应中间体以研究纤维素化学中的反应机制
DOI：
10.1007/12_098
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
P. Kosma
中科院分区：
文献类型：
--
作者：
T. Rosenau;A. Potthast;P. Kosma
与特定清除剂的反应，即所谓的捕获，是证明反应体系中反应中间体存在的直接方法，从而阐明潜在的反应机制。在介绍了化学中间体、化学捕获以及纤维素存在下捕获方法的特点后，选择了纤维素化学的四个章节来说明如何使用捕获来确定反应中间体，证明反应中间体在各自的反应体系中的存在，并最终帮助建立反应机理。这四个主题是：莱赛尔涂料中导致纤维素降解的自由基和离子中间体、DMAc/LiCl 溶液中纤维素的化学性质、浸泡条件下碱纤维素的老化以及二甲亚砜 (DMSO) 混合物中碳苯胺化过程中的纤维素降解。
Reaction with specific scavenger agents, so-calledtrapping, is a direct way to prove the occurrence of reactive intermediates in a reaction system, and thus to elucidate the underlying reaction mechanisms. After an introduction on chemical intermediates, chemical trapping and the peculiarities of trapping methodology in the presence of cellulose, four chapters from cellulose chemistry were selected to illustrate how trapping can be used to determine reactive intermediates, to prove the occurrence of reactive intermediates in the respective reaction system, and to finally help establish the reaction mechanism. The four topics are: radical and ionic intermediates in Lyocell dopes that cause cellulose degradation, the chemistry of cellulose in DMAc/LiCl solutions, aging of alkali cellulose under steeping conditions, and cellulose degradation during carbanilation in dimethyl sulfoxide (DMSO) mixtures.