Patent · US Expired

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

US4296241A · kind A · utility

3Cited by

1References

9Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Hellmut Hoffmann
Fritz Maurer · Wuppertal, DE
Uwe Priesnitz · Solingen, DE
Hans-Jochem Riebel · Bad Camberg, DE

Key dates

Filing date	Jul 2, 1980
Grant date	Oct 20, 1981
Priority date	—
Expiry date	Jul 2, 2000

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C51/363
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.