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:
May. 05, 1992
Filed:
Jun. 25, 1990
Yoshimasa Ishimura, Kawasaki, JP;
Yohei Kurata, Kawasaki, JP;
Showa Denko K.K., Tokyo, JP;
Abstract
A method for producing L-ascorbic acid 2-phosphates, is disclosed which comprises phosphorylating L-ascorbic acid whose hydroxyl groups at the 5- and 6-positions are unprotected or protected with a protective group, or salts thereof, with a phosphorus oxyhalide to form corresponding L-ascorbic acid 2-phosphates, wherein a reaction mixture obtained after the phosphorylation reaction is heated to convert by-products derived from L-ascorbic acid into L-ascorbic acid, which again is subjected to the phosphorylation reaction with the phosphorus oxyhalide. The method produce L-ascorbic acid 2-phosphates in a high yield and at a high purity with simple operations.