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US4000156A Preparation of 4-methyl-2-pyrazolin-5-ones 失效
4-甲基-2-吡唑啉-5-酮的制备

Preparation of 4-methyl-2-pyrazolin-5-ones
摘要:
A method is described for the preparation of a 1-substituted 4-methyl-2-pyrazolin-5-one by catalytic hydrogenation under pressure and simultaneous methylation by means of paraformaldehyde of the appropriate 1-substituted 2-pyrazolin-5-one in a medium of an inert organic solvent comprising ammonium acetate.
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