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 2 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/dimethyl formamide mixture.

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