Fluorosulfonium Hexafluoroarsenate RSF₂ ⁺AsF₆⁻ / Fluorosulfonium Hexafluoroarsenates, RSF₂+AsF₆⁻

Abstract

The crystal structures of Me2NSF2⁺ AsF6⁻ (4) and CF3SF2+AsF6⁻ (6) are reported and the cation structures compared with those of the corresponding isoelectronic neutral phosphanes.

Aminodifluorosulfinium Salts: Selective Fluorination Reagents with Enhanced Thermal Stability and Ease of Handling,

“…( 21 ) Over a decade later, Pauer et al determined the crystal structure of dimethylaminodifluorosulfinium hexafluoroarsenate. ( 22 ) More recently, Pashinnik et al reported that morpholinosulfur trifluoride reacts with SeF 4 to form morpholinodifluorosulfinium pentafluoroselenate. ( 23 ) Throughout these accounts, the chemical reactivity of isolated dialkylaminodifluorosulfinium salts has been scarcely studied.…”

“…A year later, Mews and Henle also reported that dimethylaminosulfur trifluoride readily loses a fluoride to BF 3 . Over a decade later, Pauer et al determined the crystal structure of dimethylaminodifluorosulfinium hexafluoroarsenate . More recently, Pashinnik et al reported that morpholinosulfur trifluoride reacts with SeF 4 to form morpholinodifluorosulfinium pentafluoroselenate .…”

“…determined the crystal structure of dimethylaminodifluorosulfinium hexafluoroarsenate 22. More recently, Pashinnik et al reported that morpholinosulfur trifluoride reacts with SeF 4 to form morpholinodifluorosulfinium pentafluoroselenate.…”

Aminodifluorosulfinium Tetrafluoroborate Salts as Stable and Crystalline Deoxofluorinating Reagents

“… 8 , 9 Since this initial discovery, other dialkylaminodifluorosulfinium salts ( 7 − 9 ) have been reported, all of which were prepared by the reaction of a DAST-type reagent with fluoride ion acceptors such as BF 3 , PF 5 , SeF 4 , SbF 5 , and AsF 5 . ( 10 ) Besides fluorination of silylamines, 8 , 10d the reactivity of dialkylaminodifluorosulfinium salts as reagents has been scarcely studied. To the best of our knowledge, not a single deoxofluorination reaction of an alcohol, aldehyde, ketone, or carboxylic acid has ever been reported.…”

“…Distinctly isolated and characterized dialkylaminodifluorosulfinium salts have been known for over three decades. Markovskii et al first reported that DAST ( 1 ) and the dimethylamino, piperidino, and morpholino analogues all react with BF 3 ·Et 2 O to form the corresponding dialkylaminodifluorosulfinium tetrafluoroborates 3 − 6 . , Since this initial discovery, other dialkylaminodifluorosulfinium salts ( 7 − 9 ) have been reported, all of which were prepared by the reaction of a DAST-type reagent with fluoride ion acceptors such as BF 3 , PF 5 , SeF 4 , SbF 5 , and AsF 5 . Besides fluorination of silylamines, , the reactivity of dialkylaminodifluorosulfinium salts as reagents has been scarcely studied.…”