Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1975-06-10
1977-02-15
Weinberger, Lorraine A.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
C07C 6118
Patent
active
040082687
ABSTRACT:
A process for isomerizing 2-(.beta.,.beta.-dichlorovinyl)-3,3-dimethylcyclopropanecarboxylic acid represented by the formula, ##STR1## which comprises heating the acid of the formula (I) in the presence of the anhydride of the acid or a reagent producing the acid anhydride in the reaction system.
The ester resulting from 2-(.beta.,.beta.-dichlorovinyl)-3,3-dimethylcyclopropanecarboxylic acid and, for example, 3-phenoxybenzyl alcohol is a compound which has a very wide range of insecticidal spectrum and has a very high controlling effect as a low-toxicity insecticide not only for domestic use and public health but also against insects injurious to agriculture or forestry, and in the case of the 3-phenoxybenzyl ester or 5-benzyl-3-furylmethyl ester of the 2-(.beta.,.beta.-dichlorovinyl)-3,3-dimethylcyclopropanecarboxylic acid, the trans-isomer is lower than the cis-isomer in toxicity to warm-blooded animals.
REFERENCES:
patent: 2815362 (1957-12-01), Harper
patent: 3046299 (1962-07-01), Julia
patent: 3538143 (1970-11-01), Matsui
patent: 3794680 (1974-02-01), Matsui
patent: 3906026 (1975-09-01), Nagase
Itaya Nobushige
Magara Osamu
Mizutani Toshio
Nishijima Toshiko
Shippen Michael
Sumitomo Chemical Company Limited
Weinberger Lorraine A.
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