V. Kozhevnikov et al., MOLYBDOVANADOPHOSPHATE HETEROPOLYANION CATALYZED OXIDATION OF 2,3,6-TRIMETHYLPHENOL BY DIOXYGEN IN A 2-PHASE SYSTEM, Journal of chemical research. Synopses, (5), 1996, pp. 238-239
The oxidation of 2,3,6-trimethylphenol with O-2 is catalysed by molybd
ovanadophosphate heteropolyanions in a two-phase aqueous-organic syste
m to yield 84% trimethyl-p-benzoquinone; the product can be easily iso
lated from the organic phase, while the aqueous phase, containing the
catalyst, can be re-used without loss of activity.