Aerobic Oxidation of Ethylbenzene Co-catalyzed by N-Hydroxyphthalimide and Oxobis(8-Quinolinolato) Vanadium (IV) Complexes

作者：Qin Jinwei; Fu Zaihui^*; Liu Yachun; He Xiangling; Zhang Dexi; Wu Wenfeng; Wang Yanlong; Gong Xinglang; Deng Xiaolin; Wu Haitao; Zou Yanhong; Yu Ningya; Yin Dulin

来源：Chinese Journal of Catalysis, 2011, 32(8): 1342-1348.

DOI：10.1016/S1872-2067(10)60255-0

• n-hydroxyphthalimide
• oxobis(8-quinolinolato) vanadium (IV)
• aerobic oxidation
• ethylbenzene
• acetophenone

The mediation effect of vanadium compounds on the N-hydroxyphthalimide (NHPI)-catalyzed aerobic oxidation of ethylbenzene (EB) was investigated at 90 degrees C in benzonitrile. Among the vanadium mediators examined, a series of oxobis(8-quinolinolato) vanadium (IV) complexes (V(IV)OQ(2)), which were prepared by the coordination of 8-hydroxyquinoline or its derivatives with oxobis(2,4-pentanedionate) vanadium (IV) ((VO)-O-IV(acac)(2)) showed a better mediation effect than (VO)-O-IV(acac)(2), NH4VO3, and V2O5 and they gave about 60%-69% EB conversion and 97% of acetophenone (AcPO) selectivity under optimum reaction conditions. This is due to the dual catalysis effects of these V mediators on the transformation of NHPI to the phthalimide-N-oxyl (PINO) radical and the decomposition of 1-phenylethyl hydroperoxide to AcPO, as supported by UV-Vis spectral characterization.

• 出版日期2011-8
• 单位湖南师范大学