Sulfur Fluoride

Sulfur Fluoride

 

any of a group of compounds of sulfur with fluorine that includes SF6, SF4, S2 F10, SF2, and S2 F2. Only the first three compounds have practical importance.

Sulfur hexafluoride (SF6) is a colorless, odorless gas with a density 5.107 times that of air (20°C), a melting point (mp) of - 50.5°C and a boiling point (bp) of - 63.8°C. The compound is only slightly soluble in water but dissolves somewhat more readily in alcohol. Upon heating in oxygen or hydrogen, sulfur hexafluoride does not undergo chemical change but is decomposed by hydrogen sulfide into HF and S. Sulfur hexafluoride is formed by burning S in F2 and is used as a gaseous insulator for high-voltage equipment (elegas).

Sulfur pentafluoride (disulfur decafluoride, S2 F10) is a colorless liquid with a density of 2.08 g/cm3 (0°C), an mp of - 92°C, and a boiling point (bp) of 29°C. Its chemical properties are similar to those of SF6, but it is less inert and very poisonous. With CCl2, sulfur pentafluoride yields the fluorochloride SF5 Cl. Sulfur pentafluoride is formed in the reaction of elements as an admixture of SF6.

Sulfur tetrafluoride (SF4) is a colorless, highly poisonous gas with a sharp odor, an mp of - 124°C, and a bp of -40°C. It is produced by the reaction of SCl2 with NaF or of CoF3 with S. Sulfur tetrafluoride reacts with aldehydes, ketones, and other carbonyl compounds to form the coresponding organic fluorine compounds.

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The amount of sulfur fluoride (2,100 tons) and perfluorocarbons (2,200 tons) emissions were the same as the previous year, according to the report.
Examples of specific topics include nitrogen-containing organofluorine compounds through metathesis reactions, highly diastereoselective anodic fluorination, functional compounds based on hypervalent sulfur fluorides, synthesis of macrolactam marine natural products using fluorous protecting groups, solvent-peptide interaction in fluoroalcohol-water mixtures, and synthesis and conformational analysis of fluorine-containing oligopeptides.