Ethyl 2-Formylpropionate → 4-Methyl-1-(3,4-dichlorobenzyl)-pyrazol-5-one

Participants

Reaction Steps

To a solution of 7.5 g of α-formylpropionic acid ethyl ester in 50 ml ethanol were added dropwise 10.9 g 3,4-dichlorobenzylhydrazine. After stirring overnight at room temperature, the solvent was distilled off in a vacuum and the solid residue was recrystallized from ethanol. m.p. 156°C, 9.3 g (64% of theory).

Provenance & Evidence