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:
Oct. 19, 1993
Filed:
Sep. 18, 1992
Applicant:
Inventors:
Roger Hunston, Blonay, CH;
Rudolf Waditschatka, Gipf-Oberfrick, CH;
Assignee:
Ciba-Geigy Corporation, Ardsley, NY (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
568346 ;
Abstract
A process is described for the production of the known intermediate cyclopropylmethylketone which delivers a high yield, few side products, high reaction efficiency and turnover, and is more viable practically and commercially. In the presence of an excess of a Periodic Table Group I or Group II metal halide or quaternary phosphonium halide, .alpha.-acetyl-.gamma.-butyrolactone is led continuously into a reaction vessel at 170.degree.-200.degree. C. and cyclopropylmethylketone distilled off continuously. The halide is recovered and recycled in the process.