Benzaldehyde → 7-Benzylidenamino-1-ethyl-2-methyl-5-trifluoromethyl-6-chlorobenzimidazole

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Reaction Steps

Benzaldehyde (0.78 g.; 7.35 mmole) was reacted with 1-ethyl-2-methyl-5-trifluoromethyl-6-chloro-7-aminobenzimidazole (1.0 g.; 3.66 mmole) in the presence of 7 ml. of xylene and a few crystals of benzenesulfonic acid. The mixture was refluxed for 1 hour, removing water from the reaction mixture. Upon cooling to room temperature, the product crystallized out of solution to give 1.24 g. (94% yield). After recrystallization from benzene, the product melts at 183°-185.5° C.

Provenance & Evidence