Patent · US Expired

Method of preparing alkali metal salts of 2-pyrrolidone-5-carboxylic acid

US4946968A · kind A · utility

11Cited by

2References

4Claims

0Family size

Assignee

Degussa AG · DE

Inventors

Hans-Peter Krimmer · Burgkirchen an der Alz, DE
Karlheinz Drauz · Alzenau, DE
Hans Remmel · Alzenau, DE

Key dates

Filing date	Oct 17, 1988
Grant date	Aug 7, 1990
Priority date	—
Expiry date	Oct 17, 2008

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D207/28
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Alkali metal salts of 2-pyrrolidone-5-carboxylic acid (pyroglutamic acid) are prepared by heating the corresponding alkali metal salt of glutamic acid to a temperature between its melting point and 270.degree. C. until the water liberated by the intramolecular condensation (cyclocondensation) has been completely eliminated.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.