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:
Apr. 30, 2019
Filed:
Mar. 15, 2016
Applicant:
Central Glass Company, Limited, Ube-shi, Yamaguchi, JP;
Inventors:
Assignee:
Central Glass Company, Limited, Ube-shi, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C 45/67 (2006.01); C07C 49/16 (2006.01); C07C 51/295 (2006.01); C07C 59/115 (2006.01); C07C 67/307 (2006.01); C07C 69/716 (2006.01);
U.S. Cl.
CPC ...
C07C 67/307 (2013.01); C07C 45/676 (2013.01); C07C 51/295 (2013.01); C07C 69/716 (2013.01);
Abstract
Disclosed is a practical method for production of 3,3-difluoro-2-hydroxypropionic acid, which is important as pharmaceutical and agrichemical intermediates. The method includes forming a 4,4-difluoro-2,2-dichloro-3-oxobutanoic acid ester by reaction of a 4,4-difluoro-3-oxobutanoic acid ester with chlorine (Cl), forming 3,3-difluoro-1,1-dichloro-2-propanone by reaction of the chlorination product with an acid, and then, reacting the degradation product with a basic aqueous solution.