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. 22, 1985
Filed:
Nov. 16, 1983
Applicant:
Inventors:
Mitsukuni Ayabe, Tokyo, JP;
Tunehiko Shimizui, Tokyo, JP;
Iwao Kibayashi, Tokyo, JP;
Hideki Hirano, Tokyo, JP;
Assignee:
Denki Kagaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
548308 ; 562443 ;
Abstract
A precursor of phenylalanine containing as a major component 5-benzylhydantoin is prepared by reacting, in an aqueous medium, a bisulfite addition salt of phenylacetaldehyde with cyanide and carbonate ions, each being in a molar ratio of equimol or more to said bisulfite addition salt and ammonium ion in a molar ratio of 2 or more to said carbonate ion. The thus prepared precursor of phenylalanine may be converted into phenylalanine by a hydrolysis under a basic or acidic condition.