Removal of ketene impurities in the preparation of alpha-cyano-a

Details Removal of ketene impurities in the preparation of alpha-cyano-a Removal of ketene impurities in the preparation of alpha-cyano-a

1978-11-02

1980-04-22

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260544D, 2605855, C07C12000, C07C12175

Patent

active

041995279

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.

REFERENCES:
patent: 2369919 (1945-02-01), Sauer
patent: 3835176 (1974-09-01), Matsuo et al.
patent: 4110360 (1978-08-01), Sheldon et al.
Lecher et al., Chemical Abstracts, vol. 40, 1869 (1945).
Yakubovich et al., Chemical Abstracts, vol. 43, 564 (1948).
Jochem et al., Chemical Abstracts, vol. 77, 87907n (1972).

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