The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 22, 1980
Filed:
Nov. 02, 1978
Walter L Petty, Houston, TX (US);
Shell Oil Company, Houston, TX (US);
Abstract
An improved process for preparation of insecticidal esters of alpha-cyano-m-aryloxybenzyl alcohols is disclosed which includes the steps of preparing an acid chloride of the formula: ##STR1## by reacting the corresponding acid with thionyl chloride, purifying the acid chloride thus obtained by fractional distillation and reacting the purified acid chloride with a phenoxybenzaldehyde and a cyanide solution to yield the desired insecticidal product. In this improved process, the presence of difficult to remove ketene reaction products in the final insecticidal product is avoided by treating the purified acid chloride with an ahydrous hydrogen halide prior to reaction with the phenoxybenzaldehyde.