METHOD OF PREPARING BENZYL DICHLOROVINYLDIMETHYLCYCLOPROPANECARBOXYLATES

A process for the preparation of a substituted vinyl-cyclopropanecarboxylic acid ester of the formula in which R1 and R2 each independently is alkyl with 1-4 carbon atoms or halogen, R3 is halogen, phenoxy or phenoxy substituted by alkyl with 1-4 carbon atoms or by halogen, R4 is halogen or methyl,...

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Bibliographische Detailangaben
Hauptverfasser:	KLAUS NAUMANN, TOMAS SHMIDT, RYUDIGER SHUBART
Format:	Patent
Sprache:	eng ; rus
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS AGRICULTURE ANIMAL HUSBANDRY BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES, AS HERBICIDES CHEMISTRY FISHING FORESTRY HUMAN NECESSITIES HUNTING METALLURGY ORGANIC CHEMISTRY PEST REPELLANTS OR ATTRACTANTS PLANT GROWTH REGULATORS PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTSTHEREOF TRAPPING
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Beschreibung
Zusammenfassung:	A process for the preparation of a substituted vinyl-cyclopropanecarboxylic acid ester of the formula in which R1 and R2 each independently is alkyl with 1-4 carbon atoms or halogen, R3 is halogen, phenoxy or phenoxy substituted by alkyl with 1-4 carbon atoms or by halogen, R4 is halogen or methyl, and n is 0, 1, 2, 3 or 4, comprising saponifying with alkali an ester of the formula in which R5 is alkyl with 1-4 carbon atoms, thereby to replace R5 by an alkaline salt group, and directly reacting such salt without intermediate purification with a benzyl chloride of the formula Advantageously the benzyl chloride is obtained by the gas-phase photochlorination of a compound of the formula (IV), the chlorination proceeding to about 25 to 75%, and the chlorination mass being employed directly without isolation.