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:
Sep. 13, 1977
Filed:
Apr. 05, 1976
Applicant:
Inventors:
Alain Krief, Boninne, BE;
Laszlo Hevesi, Jambes, BE;
Assignee:
Roussel Ulcaf, Paris, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
560124 ;
Abstract
A novel process for the preparation of alkyl esters of dl-trans chrysanthemic acid of the formula ##STR1## wherein R is alkyl of 1 to 6 carbon atoms comprising reacting in the presence of a strong base an alkyl 4-oxo-2E-butenoate of the formula ##STR2## with at least about 2 molar equivalents of a triphenyl isopropyl phosphonium halide which uses easily accessible starting materials.