Assessing Fluorosulfonyl Pentafluorooxosulfate (FSO2–OSF5) Reservoir Capacity: Selective SOF4, SO2F2, and [OSF5]– Anion Release

Tidying away gases and anions. The complementary storage & in-solution release of tetrafluoride (SOF₄), sulfuryl fluoride (SO₂F₂) and pentafluorooxosulfate (OSF₅) anions was achieved. This was performed using fluorosulfonyl pentafluorooxosulfate (FSO₂-OSF₅) a stable, high boiling liquid, obtained from SO₂ and the pentafluorosulfur hypofluorite (FOSF₅) prepared quantitatively in gram-scale. Here, the gas free anion precursor of the emerging OSF₅ chemistry and a dual-SuFEx reagent for one-pot synthesis of Sulfonyl fluoride (─SO₂F) and Sulfurimidoyl Fluoride (─N═S(O)F₂) is presented.

Abstract

Herein, the investigation of inorganic reagents containing the pentafluorooxosulfate (OSF₅) moiety is presented. First, the gram-scale preparation of the reactive yet stable pentafluorosulfur hypofluorite (FOSF₅) as well as its spectroscopic data are reported. Then, the preparation and full characterization of the corresponding fluorosulfonyl pentafluorooxosulfate (FSO₃SF₅, FSPO) by the fluoro-pentafluorooxosulfanylation of SO₂ are highlighted. This liquid reagent (b.p. 39.6 °C) was later successfully used for modulable release of [cat][OSF₅] ion-pair. The selective, in-solution release of SOF₄ and SOF₄/SO₂F₂ species was also demonstrated. Finally, the SuFEx reactivity was investigated and showed interesting reservoir ability. Indeed, we report the one-pot synthesis of sulfonyl fluoride (-SO₂F) and sulfurimidoyl fluoride (─N═S(O)F₂) species.

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