1-hydroxypyrazole-4-carboxylic acid, its preparation and its...

Details 1-hydroxypyrazole-4-carboxylic acid, its preparation and its... 1-hydroxypyrazole-4-carboxylic acid, its preparation and its...

C - Chemistry, Metallurgy

07

D

260/315.3

C07D 231/14 (2006.01)

Patent

CA 1283117

Abstract of the Disclosure: 1-Hydroxypyrazole-4-carboxy- lic acid is prepared by heating an alkali metal or alka- line earth metal salt of 1-hydroxypyrazole, or a mixture of 1-hydroxypyrazole with an alkali metal or alkaline earth metal carbonate or bicarbonate, at from 120 to 250°C for from 1 to 40 hours under a CO2 pressure of 20-300 bar, and is used for the preparation of pharmacologically use- ful compounds.

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