VERFAHREN ZUR HERSTELLUNG VON DIHALOGEN-VINYL-CYCLOPROPANCARBONSAEUREN

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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Bibliographic Details
Main Authors ZOLTAN, SANDOR, PUSKAS, TIVADAR, SOMFAI, EVA, MUSKOVITS, JOZSEF, HIDASI, GYOERGY, KOLTA, REZSOE, LINDWURM, FERENC, SOOS, RUDOLF
Format Patent
LanguageGerman
Published 15.04.1986
Edition4
Subjects
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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Summary: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.
Bibliography:Application Number: CH19820001053