以钒基化合物为催化剂,在TEMPO(2,2,6,6-四甲基哌啶-1-氧自由基)存在下,能形成快速催化分子氧氧化苯制苯酚的催化体系.在反应过程中,由类似芬顿试剂反应过程生成的羟基自由基亲核进攻苯环,形成羟基环己二烯自由基；该羟基氢可在TEMPO存在的催化体系中消除,同时苯环氢可立即转移至氧原子而生成苯酚.在以[(CH3)4N]4-PMo11VO40为催化剂的体系中,反应1h苯酚收率可从不加TEMPO时的1.2％提高到8.4％;而以V-AIPO5为催化剂时,苯酚收率可从不加TEMPO时的5.0％提高到9.5％,且选择性均较高.
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