Chinese Journal of Applied Chemistry ›› 1987, Vol. 0 ›› Issue (6): 73-75.
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Xu Xiaolong, Li Zhuang, Na Yuxian, Liu Guozhi
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Abstract: Cyclopropanation of dimethyl maleate with dibromomethane catalyzed by in situ generated Co(0)-or Ni (0)-complex under ultrasonic waves is reported in this paper. The ultrasound accelerates the formation of intermediate complexes: Co(E-H3CO2CH-CHCO2CH3)2(CH3CN)2 and Ni(Z-H3CO2CH=CHCO2CH3 )2CH3CN, increases the yield of the reaction product and reduces the reaction time. An adequate method for dimethyl 1,2-cyclopropane-dicarboxylate preparation is described.
Xu Xiaolong, Li Zhuang, Na Yuxian, Liu Guozhi. CYCLOPROPANATION OF DIMETHYL MALEATE BY ULTRASOUND AND Ni(0)-,Co(0)-ZINC CATALYST SYSTEM[J]. Chinese Journal of Applied Chemistry, 1987, 0(6): 73-75.
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