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Model studies on reactions occurring in oxidations of lignin with molecular oxygen in Alkaline Media

✍ Scribed by K. Kratzl; P. Claus; W. Lonsky; J. S. Gratzl

Publisher
Springer
Year
1974
Tongue
English
Weight
826 KB
Volume
8
Category
Article
ISSN
0043-7719

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✦ Synopsis

Basic reactions governing the degradation of lignin in oxidation with molecular oxygen are discussed emphasizing the radical (homoly~ic) or one-electron transfer-oxidations in the initial phase. The eriticM oxidation potentials (COP) according to Fieser were found to represent a useful measure for the ease of electron release from lignin-related phenolic models. At low alkalinity rough correlations were observed between the measured COPs and the initial oxygenation rates. The results obtained from quantum mechanical calculations of critical oxidation potentials are briefly discussed.

The importance of phenoxy radicals and the hypothetical cyclohexadienone hydroperoxides as intermediates is outlined in view of such degradation reactions as oxidative side-chMn eliminations, demethoxylations, and splitting of aromatic rings.

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