PROCEDE DE PREPARATION D'ACIDES DIHALOVINYL-CYCLO-PROPANE-CARBOXYLIQUES

The invention relates to a new process for the preparation of cyclopropanecarboxylic acids of the formula (I) (I) wherein X and Y independently stand for halogen, by the alkaline hydrolysis of the corresponding alkyl esters having 1 to 6 carbon atoms in the alkyl moiety, in or without a water-miscib...

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Bibliographische Detailangaben
1. Verfasser:	FERENC LINDWURM, JOZSEF MUSKOVITS, SANDOR ZOLTAN, REZSO KOLTA, RUDOLF SOOS, TIVADAR PUSKAS, EVA SOMFAI ET GYORGY HIDASI
Format:	Patent
Sprache:	fre
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS APPARATUS THEREFOR CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY GENERAL METHODS OF ORGANIC CHEMISTRY METALLURGY ORGANIC CHEMISTRY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	The invention relates to a new process for the preparation of cyclopropanecarboxylic acids of the formula (I) (I) wherein X and Y independently stand for halogen, by the alkaline hydrolysis of the corresponding alkyl esters having 1 to 6 carbon atoms in the alkyl moiety, in or without a water-miscible organic solvent, in the presence of a phase transfer catalyst. The hydrolysis is carried out with a 2 to 50% by weight aqueous alkali hydroxide solution. If desired, under suitable conditions the cis/trans ratio of the original ester can be altered in the end products. The cyclopropanecarboxylic acids of the formula (I) are obtained in a high purity and are useful intermediates of insecticidally active pyrethroids.