Synthesen mit 2,4,4‐Trifluor‐1,3‐dithietan‐2‐ylium‐hexafluoroarsenat

Syntheses with 2,4,4Trifluoro‐1,3‐dithietan‐2‐ylium Hexafluoroarsenate The 2‐bromo and 2‐iodo cations ‐X (XBr, I) are prepared as stable salts 3a and 4a from the title compound ‐F AsF ‐ 6 ( 1a ). Salt 1a reacts with BaCS 3 to yield the new cyclic thiocarbonyl compound ( 5 ). Alkylation of 5 with CF 3 F/AsF 5 produces the trithiocarbenium salt ‐SCH 3 AsF ‐ 6 ( 5a ). Difluorothiophosgene ( 7 ) and its trimer (F 3 CS) 2 CS ( 8 ) add to the cation of 1a to form ‐SCF 3 AsF ‐ 6 ( 10a ), the perfluorinated analog of 5a . The cation of 10a unlike 5a adds a fluoride ion to give ‐SCF 3 ( 10 ), a new isomer of 8 .