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Ethylenediamines reacted readily with 4-ethoxyl-1, 1, 1-trifluoro-3-butene- 2one to form 5-trifliuoromathyl-2,3-diazepine in good yields. Under the same reaction condition, o-phenylene diamine gave 2-trifluoro- methyl benzimidazole and benzimidazole.
Under the same reaction condition, o-phenylene diamine gave 2-trifluoro-4-ethoxyl-1,1-trifluoro-3-butene-2one to form 5-trifliuoromathyl- - methyl benzimidazole and benzimidazole.