Chinese Journal of Applied Chemistry ›› 2016, Vol. 33 ›› Issue (11): 1284-1288.DOI: 10.11944/j.issn.1000-0518.2016.11.160008

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One-pot Green Synthesis of Benzil

XIE Kangyuan,CHEN Qiang,WANG Jiayao,LIN Qingqing,ZHENG Hui()   

  1. College of Material,Chemistry & Chemical Engineering,Hangzhou Normal University,Hangzhou 310036,China
  • Received:2016-01-06 Accepted:2016-04-19 Published:2016-11-01 Online:2016-11-01
  • Contact: ZHENG Hui

Abstract:

One-pot green synthesis of benzil catalyzed by Co(Salen) from benzoin in alcohol-water was developed. The products was confirmed by 1H NMR, 13C NMR, IR, HRMS and XRD. The orthogonal experimental design gives the optimal reaction conditions about the catalyst loading, reaction time, solvents, reaction temperature, and the amount of potassium hydroxide. The best conditions is Co(Salen) catalyst, 80% alcohol-water, 50 minutes and 70 ℃. The highest yield of 76.5% could be obtained under that conditions. The catalyst can be recycled at least five times up to the 74.2% yield. It is a green method and novel protocol to synthesize benzil.

Key words: salen catalyst, benzoin, benzil, catalytic oxidation