HALOGEN-CARBON-SULFUR COMPOUNDS - SYNTHES ES WITH METHYLTHIO-4,5-BIS(TRIFLUOROMETHYL)-1,3-DITHIOLIUM TRIFLUOROMETHANESULFONATE

By reactions of the strongly electrophilic thio-4,5-bis-(trifluorometh yl)-1,3-dithiol-2-ylium trifluoromethanesulfonate (6) with nucleophile s like secondary amines, phenoles and active methylene compounds the n ew 2-amino-1,3-dithiolium salts 11a-e and 1,3-dithiol-2-ylidene compou nds 5-10, 12 were obtained. The 1,3-dithiolium salts 14 were prepared in two different ways. Reaction with PPh3 yields the phosphonium salt 16, from which the ethylidene compound 20 was obtained via the interme diate phosphorane 18. The crystal structures of 7, 16 and of the fulva lene 19 were determined.