2,3-Dichloro-5,6-dicyano-1,4-benzoquinone → 2-(2,6-Dichloro-4-trifluoromethylphenyl)-4,5-dicyanoimidazole

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Reaction Steps

A solution of 1-amino-2-(2,6-dichloro-4-trifluoromethylbenzylideneamino)-1,2-dicyanoethylene (3.3 g, 0.01 mol) and 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (3.3 g, 0.01 mol) in acetonitrile (75 ml) was stirred at reflux for 48 hours. Evaporation of the solvent yielded a brown solid which was continuously extracted with boiling toluene. The solution was evaporated under reduced pressure and the red-brown residue was dissolved in a mixture of ethyl acetate and dichloromethane (1:10) and filtered through silica. Evaporation of the liltrate gave a brown solid which was triturated with hexane and the solid was removed by filtration to give 2-(2,6-dichloro-4-trifluoromethylphenyl)-4,5-dicyanoimidazole (1.4 g) as a light brown solid, m.p. 194°-195° C.

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