C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/526.8
C07C 59/347 (2006.01) C07C 51/00 (2006.01) C07C 59/185 (2006.01) C07D 209/18 (2006.01) C07D 233/96 (2006.01) C07F 1/00 (2006.01)
Patent
CA 1096881
Docket No. 5102 PREPARATION OF ALIPHATIC AND HETEROCYCLIC ALPHA-KETO CARBOXYLIC ACIDS Abstract of the Disclosure A crude alkali metal salt of an aliphatic or hetero- cyclic alpha-keto carboxylic acid is prepared by hydrolyzing a 5-alkylidene hydantoin or a hydantoin having the formula Image in which R1 is a heterocyclic moiety in an aqueous solution of an alkali metal hydroxide. The crude alkali metal salt of the alpha-keto carboxylic acid can be separated and recovered (e.g., by evaporating water therefrom to form a mixture of said salt and an alkali metal carbonate). Alter- natively, the crude alpha-keto carboxylic acid can be con- verted to the corresponding free alpha-keto carboxylic acid by treatment with a strong acid. The resulting alpha-keto carboxylic acid can then be recovered (e.g., by extracting with ether and evaporating the ether therefrom). The alpha- keto carboxylic acids have many uses which may include use as starting materials for amino acid synthesis, use as pharmaceut- icals against uremia, use as catalylitic materials in the co- polymerization of unsaturated monomers and as hair treating agents. -1-
284976
Gowling Lafleur Henderson Llp
Grace (w.r.) & Co.
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