Preparation of 1,1-diphenyl-2-carboethoxycyclopropane

Details Preparation of 1,1-diphenyl-2-carboethoxycyclopropane Preparation of 1,1-diphenyl-2-carboethoxycyclopropane

1985-08-02

1986-08-12

Lone, Werren B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

560102, C07C 6976

Patent

active

046057552

ABSTRACT:
An improved process is disclosed for preparing racemic 1,1-diphenyl-2-carboethoxycyclopropane from 1,1-diphenylethylene and ethyl diazoacetate as reactants. It involves conducting the reaction in the absence of a metallic-based catalyst and at a reaction temperature sufficiently in excess of 60.degree. C. to permit a yield of at least 20 percent to be obtained. Preferred conditions are given for obtaining yields in excess of 80 percent.
Related processes are also disclosed based on certain substituted 1,1-diphenylethylenes with at least one substituent in at least one phenyl group.

REFERENCES:
patent: 4157447 (1979-06-01), Engel
Tatsuno et al., "J. C. S. Chem. Comm.", (1942), pp. 588-589.
Walborsky et al., "J. Amer. Chem. Soc.", vol. 83, (1961), pp. 2517-2525.
Yanke et al., "J. Amer. Chem. Soc.", V95, (1973), pp. 4220-4230.

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