Hydrazinecarboxylic acid, ethyl ester → 4-Chloro-4'-methylsulfinylmethylbenzophenone ethoxycarbonylhydrazone

Participants

Reaction Steps

An ethanol solution (100 ml) of 4-chloro-4'-methylsulfinylmethyl benzophenone (5.8 g), ethyl carbazate (6.3 g) and pyridinium p-toluenesulfonate (0.1 g) was heated for 6 hours with refluxing. After cooling to a room temperature, the reaction mixture was poured into ice-water, and the precipitated crystals were collected by filtration, and washed successively with an aqueous sodium bicarbonate solution and water. After air-drying, 4-chloro-4'-methylsulfinylmethylbenzophenone ethoxycarbonylhydrazone (6.4 g) was obtained as an isomer mixture.

Provenance & Evidence