Reaction selectivity of active oxygen species produced by oxygen-alkali oxidation of a phenolic compound
Reaction selectivity of active oxygen species produced by oxygen-alkali oxidation of a phenolic compound
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酚类化合物氧碱氧化产生活性氧的反应选择性
DOI：
10.1007/bf01130459
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发表时间：
1998
影响因子：
2.9
通讯作者：
G. Meshitsuka
中科院分区：
文献类型：
--
作者：
T. Yokoyama;I. Maekawa;Y. Matsumoto;G. Meshitsuka
在氧漂过程中，碳水化合物的降解不是由分子氧直接引起的，而是由作为木质素和分子氧的次级反应产物的活性氧物质引起的。除了碳水化合物的降解外，活性氧物质被认为在氧漂过程中的脱木素中起作用。Ek和她的同事得出结论，羟基自由基（HO.）非酚类木质素模型化合物的降解速度比碳水化合物模型化合物快五到六倍）他们的结果似乎已被广泛接受，因为在氧漂白过程中木质素和碳水化合物之间活性氧物种的反应选择性。然而，概括他们的结果是不合适的，因为在氧漂白过程中产生的活性氧物种不能限于羟基自由基，并且在他们的报告中检查的模型化合物的结构多样性不足以得出一般性结论。6-三甲基苯酚（TMPh）与分子氧在铁离子存在下。通过该反应，底物可以与以类似于氧漂白工艺的方式产生的各种活性氧物质进行反应。该反应体系含有TMPh 9mmol/l，FeCl 3 0.36mmol/l，
In an oxygen bleaching process, the degradation of carbohydrate is not directly caused by molecular oxygen but by active oxygen species that are secondary reaction products of lignin and molecular oxygen. 1'In addition to the degradation of carbohydrate, active oxygen species are thought to play a role in delignification during oxygen bleaching. Ek and her coworkers concluded that hydroxyl radical (HO.) degrades nonphenolic lignin model compounds five to six times faster than carbohydrate model compounds) Their results seem to have been widely accepted as the reaction selectivity of active oxygen species between lignin and carbohydrate during oxygen bleaching. However, it is inappropriate to generalize their results because active oxygen species produced during an oxygen bleaching process cannot be restricted to the hydroxyl radical, and the structural variety of the model compounds examined in their report is not enough to draw a general conclusion.In the present report, active oxygen species were generated by the reaction of 2, 4, 6-trimethylphenol (TMPh) with molecular oxygen in the presence of ferric ion. 1'2 By this reaction, substrates can be subjected to the reaction with a variety of active oxygen species generated in a manner similar to that of an oxygen bleaching process. This reaction system contained TMPh 9mmol/1, FeC13 0.36 mmol/1, and