Esters of 2-(2-chlorocarbonyl)-2-(2,3-dihydro-2-alkylbenzofuran-7-yl)hydrazinecarbox ylic acid, useful as pesticides and/or as percursors to pesticides.
This application is a continuation-in-part of Application Ser. No. 276,303, filed June 22, 1981, abandoned which is a continuation-in-part of Application Ser. No. 187,235, filed Sept. 15, 1980 abandoned.
The invention relates to novel unsubstituted or substituted 2-fluorocarbonyl-2-(2,3-dihydrobenzofuran-7-yl)hydrazinecarboxylic acid esters of formula ##STR1## wherein R.sub.1 and R.sub.2 are each independently of the other hydrogen or C.sub.1-C.sub.3 alkyl, R.sub.3 and R.sub.4 are each independently of the other hydrogen, halogen, C.sub.1 -C.sub.4 alkyl or C.sub.1 -C.sub.4 -alkoxy, and R.sub.5 is C.sub.1 -C.sub.4 alkyl to the preparation of said compounds and to compositions containing them for use in pest control, especially for controlling insects that attack plants and animals. The novel compounds are particularly effective for controlling plant destructive sucking insects.
