Reaktion von cyanformamidinen MIT 2,2,4,4-tetrakis(trifluormethyl) -1,3-dithietan

The reaction of cyanogen with secondary amines at low temperatures leads to N.N-dialkylformamidines, which react further with 2,2,4,4-tetrakis(trifluoromethyl) -1,3-dithiane to yield substituted 2,5-dihydro-5-imino-2,2-bis(trifluoromethyl)- thiazole derivatives 1 and 2 . The products are obtained in a 1:3 molar ratio. This reaction is not influenced by stoichiometry or temperature.The crystal structure of 1 is reported.