Aerobic oxidative dehydrogenations catalyzed by the mixed-addenda heteropolyanion PV2Mo10O40 5-: A kinetic and mechanistic study

Ronny Neumann, Michal Levin

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Abstract

The aerobic oxidative dehydrogenation of α-terpinene to p-cymene catalyzed by the mixed-addenda heteropolyanion PV2Mo10O40 5- has been used to investigate the oxidation mechanism catalyzed by this class of compounds. The kinetics of the reaction show it to be zero order in α-terpinene, first order in dioxygen, and second order in the heteropolyanion catalyst. The kinetic results along with the use of UV-vis, ESR, 31P NMR, and IR spectroscopy have enabled the formulation of a reaction scheme involving the formation of a stable substrate-catalyst complex in the catalyst reduction (substrate oxidation) stage and a μ-peroxo catalyst intermediate in the catalyst reoxidation where dioxygen is reduced to water in a four-electron redox reaction.

Original languageEnglish
Pages (from-to)7278-7286
Number of pages9
JournalJournal of the American Chemical Society
Volume114
Issue number18
Publication statusPublished - 1992

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ASJC Scopus subject areas

  • Chemistry(all)

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