Ethyl acetylphenylacetate → 3-Methyl-4-phenyl-1-(alpha-methyl-3,4-dichlorobenzyl)-5-pyrazolone

Beteiligte Stoffe

Reaktionsschritte

20.6 g of α-phenylacetoacetic acid ethyl ester were added dropwise under nitrogen to a solution of 20.5 g (0.1 mol) of α-methyl-3,4-dichlorobenzylhydrazine in 20 ml of absolute ethanol, during which the temperature of the reaction mixture rose to 55° C. After heating the reaction solution for two hours under reflux, the reaction product crystallized out on cooling the reaction mixture. The crystals were filtered off, rinsed with ether and recrystallized from an ethanol/dimethylformamide mixture.

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