Catalytic Properties of Cobalt Tetracarbonyl/Imidazolium Ionic Liquids in the Synthesis of Dimethyl Manolate by Carbonylation

doi:10.3969/j.issn.0251-0790.2012.02.028

Abstract

Abstract: A series of [Co(Co)₄]^-/imidazolium ionic liquids was synthesized, and their catalytic properties were evaluated in the carbonylation reaction of methyl chloroacetate. The effect of imidazolium with different branched chains on the catalytic properties of [Co(Co)₄]^- species was investigated. The experimental results show that 1-butyl-3-methylimidazolium cobalt tetracarbonyl([Bmim][Co(Co)₄]) is an efficient and reusable catalyst for the carbonylation of methyl chloroacetate. At reaction conditions of p_CO=2 MPa, 85 ℃, and t=3 h, the average conversion of methyl chloroacetate was 94.3%, the average selectivity to malonic ester was 98.5% and the average yield of dimethyl malonate was 92.9% for [Bmim][Co(Co)₄] catalyst at four recycles. Compared with the traditional Na[Co(Co)₄] catalyst, [Bmim][Co(Co)₄]catalyst exhibited high activity and good reusability, which could be mostly attributed to the good stability for air of the versatile [Co(Co)₄]^- species at the circumstance of imidazolium ionic liquids.

Key words: Cobalt tetracarbonyl, Imidazolium ionic liquid, Carbonylation, Dimethyl malonate

CLC Number:

O643.3

TrendMD:

JIANG Wen-Jie, MO Wan-Ling, JIA Yong-Mei, LI Guang-Xing. Catalytic Properties of Cobalt Tetracarbonyl/Imidazolium Ionic Liquids in the Synthesis of Dimethyl Manolate by Carbonylation[J]. Chem. J. Chinese Universities, 2012, 33(02): 373.

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