Mechanism of the Transesterification of Methyl Benzoate with Ethylene Glycol Catalyzed by Metal Acetylacetonates Complexest

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  • 安息香酸メチルとエチレングリコールのエステル交換反応に対する2価遷移金属アセチルアセトナト錯体の触媒作用機構
  • 重縮合・重付加反応に対する金属錯体の触媒作用に関する研究　ＩＩＩ　　安息香酸メチルとエチレングリコールのエステル交換反応に対する２価遷移金属アセチルアセトナト錯体の触媒作用機構

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Kinetics of the transesterification of methyl benzoate (MB) with ethylene glycol (EG) catalyzed by the metal acetylacetonates was studied at 15O-17O°C. The rate constants determined from the relation RD=k[MB] ([EG]>1 mol, [Complex] <3 x1O-3 mol) are in the following order:<BR>Zn( acac)2 ( eg) > Zn (acac)2 > Co( a cac)2 ( e g) > Co( acac)2 ( H 2O)2 >>Ni ( acac)2 ( H 2O)2 > N i ( acac)2 ( eg) ( H2O>) Cu( acac)2 On the basis of the data of electronic as well as infrared sp ectra, gas chromatography, acid values, and X-ray diffraction, the reaction mechanism for this reaction was discussed by considering ( 1 ) the change in coordination structure of the metal complexes, ( 2) the nucleo philicity of the mixed complex formed between the catalyst and EG, ( 3 ) the side reactions.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1976 (6), 983-987, 1976-06-10

    The Chemical Society of Japan

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