Preparation of 3-(2,2-dichlorovinyl)-2,2-dimethyl-cyclopropane-1

Details Preparation of 3-(2,2-dichlorovinyl)-2,2-dimethyl-cyclopropane-1 Preparation of 3-(2,2-dichlorovinyl)-2,2-dimethyl-cyclopropane-1

1980-07-02

1981-10-20

Trousof, Natalie

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

Organic compounds

Carboxylic acid esters

562506, C07C 69743

Patent

active

042962412

ABSTRACT:
A process for the preparation of a 3-(2,2-dichlorovinyl)-2,2-dimethyl-cyclopropane-1-carboxylic acid or derivative of the formula ##STR1## in which R is hydrogen, alkali metal, ammonium, an equivalent of an alkaline earth metal, alkyl, or a radical customary in the alcohol part of pyrethroids,
comprising reacting a 3-formyl-2,2-dimethyl-cyclopropane-1-carboxylic acid derivative of the formula ##STR2## with a dichloromethane derivative of the formula ##STR3## in which R.sup.1 and R.sup.2 each independently is alkyl, phenyl, alkoxy or phenoxy, or together are alkanediyl or alkanedioxy,
in the presence of a base at a temperature between about -50.degree. and +50.degree. C. The products are intermediates for the preparation of esters of pyrethroid-like insecticidal activity.

REFERENCES:
patent: 4024163 (1977-05-01), Elliott
Savignac, Synthesis, 8, pp. 535-536 (1975).
Zimmer, Chemia, 28, pp. 656-657 (1974).

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