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, 1981
Filed:
Nov. 01, 1978
Applicant:
Inventors:
Wolfgang Dannenberg, Wunstorf, DE;
Horst Schmand, Bad Nenndorf, DE;
Assignee:
Riedel-de Haen Aktiengesellschaft, Seelze, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ; C07C / ; C07B / ;
U.S. Cl.
CPC ...
26050111 ; 562401 ;
Abstract
In a process for resolving racemic DL-.alpha.-aminocarboxylic acids the said acids are reacted in an inert solvent with an aromatic o-hydroxy aldehyde to obtain an azomethine derivative which is reacted in the same stage with an optically active amine base to give a salt. The diastereomeric salt obtained is separated and the respective optically active .alpha.-aminocarboxylic acid is obtained therefrom by an acid treatment. By this process aliphatic and aromatic .alpha.-amino-carboxylic acids can be resolved, especially p-hydroxyphenyl glycine.