Method of preparation of a mixture of stereo - isomers of the 2 - (4 - chlorophenyl) - isovalerate of a - cyano - 3 - phenoxybenzyl having a high activity and acaricidal and insecticidal compositions containing this mixture, insecticides, acaricides.

摘要

P new form and particularly of a compound having insecticidal properties. / p & & p & this compound is the 2 - (4 - chlorophenyl) - isovalerate of alpha - cyano - 3 - phenoxybenzyl prepared by crystallization and which essentially consists of two isomers, the (s) - 2 - (4 - chlorophenyl) - iso - valerate of (s) - alpha - cyano - 3 - phenoxybenzyl and the (r) - 2 - (4 - chlorophenyl) - isovalerate (r) - alpha - cyano - 3 - phenoxybenzyl, to the exclusion practically complete the other isomers. / p & & p & the compound according to the invention is an insecticide activity and acaricidal greater than that of the product corresponding to the prior art. / p