OXIDATION OF 2,3,6-TRIMETHYLPHENOL IN THE PRESENCE OF MOLYBDOVANADOPHOSPHORIC HETEROPOLY ACIDS

被引：81

作者：

KHOLDEEVA, OA ^{[1
]}

GOLOVIN, AV ^{[1
]}

MAKSIMOVSKAYA, RI ^{[1
]}

KOZHEVNIKOV, IV ^{[1
]}

机构：

[1] NOVOSIBIRSK CATALYSIS INST,NOVOSIBIRSK 630090,USSR

来源：

JOURNAL OF MOLECULAR CATALYSIS | 1992年 / 75卷 / 03期

关键词：

D O I：

10.1016/0304-5102(92)80128-4

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Oxidation of 2,3,6-trimethylphenol (TMP) by O2 in the presence of heteropoly acids H3+nPMo12-nVnO40 (HPA-n) in AcOH-H2O gives up to 86% 2,3,5-trimethyl-1,4-benzoquinone (TMBQ) at a 100% TMP conversion, 2,2',3,3',6,6'-hexamethyl-4,4'-biphenol (BP) also being formed. The yield of BP increases at the expense of TMBQ with increasing H2O content. BP was shown to be an intermediate in TMP oxidation to TMBQ. Evidence is provided that the catalytically active species is the VO2+ ion formed via dissociation of HPA-n. A stepwise mechanism including the oxidation of TMP by V(V) to produce TMBQ and V(IV) followed by oxidation of V(IV) to V(V) with dioxygen in the coordination sphere of the heteropoly anion is suggested.

引用

页码：235 / 244

页数：10

共 14 条

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