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:
Jul. 22, 1986
Filed:
Aug. 12, 1985
Applicant:
Inventors:
Michael Karrenbauer, Moos-Bankholzen, DE;
Axel Kleemann, Muhlheim, DE;
Assignee:
Degussa Aktiengesellschaft, Frankfurt, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ; C07B / ;
U.S. Cl.
CPC ...
548498 ; 562401 ; 562450 ; 562559 ; 562567 ; 562570 ; 562573 ;
Abstract
N-acetyl-D(L)-.alpha.-aminocarboxylic acids are thermally racemized by melting, adding a small amount of acetic anhydride to the melt and heating to a temperature between the melting temperature and about 210.degree. C. and subsequently quenching the melt with an aqueous alkali metal hydroxide or ammonia solution. The residence time needed for complete racemization depends on the heating temperature of the melt in the manner that the higher the heating temperature the shorter the residence time.