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. 17, 1976
Filed:
Mar. 28, 1975
Applicant:
Inventor:
Claude Poulain, Orsay, FR;
Assignee:
Ato Chimie, Courbevoie, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
2602 / ; 2602 / ;
Abstract
A process for preparing pure N-alkyl-lactams obtained by the reaction, in an organic solvent medium of, the corresponding lactamate of an alkali metal and an alkyl halide. This process consists of treating a reactive mixture of N-alkyl-lactam containing the corresponding cyclo-alkylene imine as an impurity with a current of carbon dioxide, until the cyclo-alkylene imine precipitates completely in the form of an insoluble carbonate, and then separating it from the precipitate.