(Perfluoralkyl)(dimethylamino)sulfonium-hexafluoroarsenate

Abstract

MeN = S(CF3)2 (5) is alkylated by Me3O AsF6 to Me2N-S(CF3)2 AsF6 (4). From 5 and MeOp. AsF6 (6) MeOS(O)-N(Me)S(CF3)2 AsF6 (7) is formed as a relatively stable primary product. Decomposition of 7 gives the expected 4 only in poor yield. Nucleophilic substitution of the sulfur-bonded fluorine in CF3SF2 AsF6 (8) by Me3SiNMe2 yields CF3S(NMe2)2 AsF6 (9). Similarly, (CF3)2CFSF2 AsF6 (10) reacts with dimethyl(trimethylsilyl)amine to give (CF3)2CFS(NMe2)2 AsF6 (11). The structures of 4 and 9 are elucidated by X-ray analyses, and the influence of the substituents on the bonding is discussed.