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:
Aug. 25, 1987
Filed:
Oct. 16, 1986
Applicant:
Inventors:
Hans Rademacher, Marl, DE;
Heinz-Werner Voges, Dorsten, DE;
Assignee:
Huls Aktiengesellschaft, Marl, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
540464 ; 540535 ; 540540 ;
Abstract
The present invention is a process for preparing lactams having 8 to 15 carbon atoms by the Beckmann rearrangement of the corresponding oximes in a solution of an organic solvent by means of 0.5 to 10% by weight referred to the oxime of an acid derivative acting as a catalyst. The anhydrides of organic sulfonic acids or of sulfuric acid half esters or mixed anhydrides of organic sulfonic acid and anhydrides of sulfuric acid half esters are used as the catalysts.