Methylhydrazine → 5-Cyclohexyl-2-methyl-2,4-dihydro-3H-pyrazol-3-one

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Reaction Steps

To ethyl 3-oxo-cyclohexanepropionic acid (4.4 g, 0.234 mole) in n-propanol (500 ml) is added dropwise with stirring under nitrogen at 80°C. methylhydrazine (13.8 g, 0.3 mole). After heating at reflux during 5 hours, the reaction is cooled and evaporated to a residual oil. Crystallization from ethylacetate gives a white powder mp 170.5°C. to 172°C.

Provenance & Evidence