The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 06, 1983
Filed:
Feb. 19, 1982
Ferenc Lindwurm, Budapest, HU;
Jozsef Muskovits, Budapest, HU;
Sandor Zoltan, Budapest, HU;
Rezso Kolta, Budapest, HU;
Rudolf Soos, Budapest, HU;
Tivadar Puskas, Budapest, HU;
Eva Somfai, Budapest, HU;
Gyorgy Hidasi, Budapest, HU;
Chinoin Gyogyszer Es Vegyeszeti Termekek Gyara Rt, Budapest, HU;
Abstract
The invention relates to a new process for the preparation of cyclopropanecarboxylic acids of the formula (I) ##STR1## 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.