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Lignin aerobic oxidation promoted by molybdovanadophosphate polyanion [PMo7V5O40]8−. Study on the oxidative cleavage of β-O-4 aryl ether structures using model compounds

2000; Elsevier BV; Volume: 154; Issue: 1-2 Linguagem: Inglês

10.1016/s1381-1169(99)00383-0

1873-314X

Dmitry V. Evtuguin, Ana Dias Daniel, Armando J. D. Silvestre, Francisco Amado, Carlos Pascoal Neto,

Oxidative Organic Chemistry Reactions

The lignin oxidative degradation in the reaction system [PMo7V5O40]8−/O2 has been studied using guaiacyl and syringyl β-aryl ether dimeric lignin model compounds. The oxidation has been monitored by GC/MS and ESI/MS. Although the free phenolic and non-phenolic model compounds were both degraded under aerobic oxidation with [PMo7V5O40]8−, the reaction mechanisms involved are different. Oxidation routes leading to the cleavage of β-O-4 bonds have been proposed.