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:
Nov. 13, 1990
Filed:
May. 31, 1989
Applicant:
Inventors:
Assignee:
Nissan Chemical Industries, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
562460 ; 562426 ; 562427 ; 562466 ; 562478 ; 562490 ; 562492 ; 562494 ; 562485 ;
Abstract
This invention relates to methods of preparing and purifying .alpha.-substituted acetic acids, which comprise treating an .alpha.aromatic-substituted acetic acid represented by a specific general formula with a weak alkali while shielding light, or subjecting an .alpha.-aromatic-substituted acetonitrile represented by a specific general formula to acid hydrolysis, followed by treatment with a weak alkali while shielding light; and treating the alkali salt of .alpha.-substituted acetic acid thus formed with a decolorizing agent.