Chloroform → 5-Hydroxy-4,5-bis-(4-methoxyphenyl)-2-thioxo-3-pyrroline-3-carbonitrile

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Reaction Steps

16.5 g. 4,4'-Dimethoxybenzil, 6.0 g. cyanothioacetamide and 15 drops of piperidine were boiled for 2 hours in 200 ml. chloroform on a water separator. The yellow precipitate obtained was filtered off with suction, washed with some chloroform and dried at 80° C. and 0.1 mm.Hg for 12 hours. The desired product is obtained in a yield of 17.6 g. in the form of yellow crystals; m.p. 193° C. (decomp.).

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