Preparation of 3-(2,2-dichlorovinyl)-2,2-dimethyl-cyclopropane-1-carboxylic acid derivatives
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United States of America Patent
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Oct 20, 1981
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N/A
app pub date -
Jul 2, 1980
filing date -
Jul 21, 1979
priority date (Note) -
Expired
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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.
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