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Sulfur tetrafluoride is a chemical compound with the formula S F 4. It is a colorless corrosive gas that releases dangerous hydrogen fluoride gas upon exposure to water or moisture. Sulfur tetrafluoride is a useful reagent for the preparation of organofluorine compounds , [ 3 ] some of which are important in the pharmaceutical and specialty ...
Fluorination by sulfur tetrafluoride produces organofluorine compounds from oxygen-containing organic functional groups using sulfur tetrafluoride. The reaction has broad scope, and SF 4 is an inexpensive reagent. It is however hazardous gas whose handling requires specialized apparatus.
The mechanism of fluorination by DAST parallels that of sulfur tetrafluoride. Attack of the hydroxyl group of the substrate on sulfur and elimination of hydrogen fluoride lead to an alkoxyaminosulfur difluoride intermediate. Nucleophilic attack by fluoride, either by an S N 1 [5] or S N 2 [6] pathway, leads to the product. Although clean ...
DAST is prepared by the reaction of diethylaminotrimethylsilane and sulfur tetrafluoride: [3] Et 2 NSiMe 3 + SF 4 → Et 2 NSF 3 + Me 3 SiF. The original paper calls for trichlorofluoromethane (Freon-11) as a solvent. [4] Diethyl ether is a green alternative that can be used with no decrease in yield. [5]
Thus, sulfur dichloride, disulfur dichloride, and higher chlorosulfanes arise from the chlorination of sulfur. Sulfuryl chloride and chlorosulfuric acid are derivatives of sulfuric acid; thionyl chloride (SOCl 2) is a common reagent in organic synthesis. [7] Sulfur halides are precursors to a variety of metal complexes. [8]
The usual reagent is sulfur tetrafluoride: RCO 2 H + SF 4 → RCF 3 + SO 2 + HF. A more convenient alternative to SF 4 is the diethylaminosulfur trifluoride, which is a liquid whereas SF 4 is a corrosive gas: [19] [20] C 6 H 5 CHO + R 2 NSF 3 → C 6 H 5 CHF 2 + "R 2 NSOF"
They can be produced by treating sulfonic acids with sulfur tetrafluoride: [13] SF 4 + RSO 3 H → SOF 2 + RSO 2 F + HF. Perfluorooctanesulfonyl derivatives, such as PFOS, are produced from their sulfonyl fluoride, which are produced by electrofluorination [14] In the molecular biology, sulfonyl fluorides are used to label proteins.
A tetrafluoride is a chemical compound with four fluorines in its formula. ... Sulfur tetrafluoride, SF 4, a gas at standard conditions; Tellurium tetrafluoride, ...