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Citation: 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, 4(6): 73-75. shu

CYCLOPROPANATION OF DIMETHYL MALEATE BY ULTRASOUND AND Ni(0)-,Co(0)-ZINC CATALYST SYSTEM

1.
Changchun Institute of Applied Chemistry, Academia Sinica

Corresponding author: Xu Xiaolong,
Received Date: 5 November 1986
Available Online: 27 February 1987
Fund Project:

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.
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