Reaction mechanism of hydroxylation of benzene to phenol catalyzed by vanadium-based catalysts
Hydroxylation of benzene to phenol is one of the challenging topics for the transition from C—H bonds to C—O bonds.In this review,the research progress on the reaction mechanism of hydroxylation of benzene catalyzed by vanadium-based catalysts to phenol was discussed.Taking vanadium activity center as main line,free radical mechanism,non-radical mechanism and dual-catalysis activity mechanism were introduced in detail,while the nature of high efficiency of such catalysts and the importance of catalytic microenvironment were analyzed.It was pointed out that such catalytic systems and catalytic mechanisms could provide theoretical guidance for solving problems such as difficult activation of C—H bonds on benzene ring and deep oxidation of phenol.Therefore,it should focus on economic and safe phenol synthesis methods,and develop more stable and high-performance catalysts relying on the existing catalytic reaction mechanism to promote the original innovation of abundant hydrocarbon organic compound resource utilization.
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