Method of preparing alkaline earth metal salts of 2-pyrrolidone-

Details Method of preparing alkaline earth metal salts of 2-pyrrolidone- Method of preparing alkaline earth metal salts of 2-pyrrolidone-

1988-10-17

1990-05-01

Brust, Joseph Paul

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D20728

Patent

active

049219715

ABSTRACT:
Alkaline earth metal salts of 2-pyrrolidone-5-carboxylic acid (pyroglutamic acid) are prepared by heating the corresponding alkaline earth metal salt of glutaminic acid in the solid state to a temperature in a range of 120.degree. C. to 250.degree. C. until the water liberated by the intramolecular condensation (cyclocondensation) has been completely eliminated.

REFERENCES:
patent: 3235563 (1966-02-01), Noyori et al.
patent: 3243440 (1966-03-01), Noyori et al.
Lichtenstein; "Preparation of .gamma.-Alkylamides of Glutamic Acid"; J.A.C.S. 64, pp. 1021-1022 (May '42 ), Moeller; Inorganic Chemistry; 1976, Wiley & Sons.

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