Fluorides elemental sulfur

The boron halides are made either by direct reaction of the elements at a high temperature or from boron oxide. The most important is boron trifluoride, BF, an industrial catalyst produced by the reaction between boron oxide, calcium fluoride, and sulfuric acid ... 

Reaction of elemental sulfur with fluoroalkyl iodides has not received very much attention, but it has been shown that sulfur converts 4,4-diiodoperfluoro-l-butene to pentafluoro-3-butenoyl fluoride. 

Sulfur tetrafluoride oxide is the only stable sulfur fluoride or sulfur fluoride oxide that is not commercially available, although its value is increasing in synthetic chemistry. It was first made by burning SOF2 in elemental fluorine,1... 

In analogy with the disproportionation in the reaction of dichlorosulfane and sodium fluoride to yield sulfur tetrafluoride, sulfur dichloride reacts with two molecules of perfluoro pinacolate to yield a spirocyclic 2 -bisthiadi-oxolane 133f with elimination of elemental sulfur (64). Compound 133f has also been obtained from the reaction of perfluoropinacol with dichlorosulfane in the presence of pyridine (18). 

Perfluoro(2-methylpropene) reacts with elemental sulfur in the presence of potassium fluoride or cesium fluoride to yield bis[tris(trifluoromethyl)methyl] trisulfide (3). ... 

Perfluoroalkylmercury compounds have been prepared by reaction of perfluoroalkyl halides with cadmium amalgam or by reaction of fluoroalkenes with mercury(II) fluoride. Due to the high thermal stability of perfluoroalkylmercury compounds, they can be sublimed from concentrated sulfuric acid without decomposition and are of limited synthetic utility. These reagents have found use as difluorocarbene sources and do react with elemental sulfur at elevated temperatures to afford thioacid fluorides, di- and polysulfides, and thioketones. ... 

Sulfur may react with alkenes either by addition to the C=C double bond or by substitution of H by S with the elimination of H2S. In both cases polysulfanes are formed. Octafluoroisobutene, (CF3)2C=CF2, reacts at 60-70 °C in dimethylformamide (DMF) and in the presence of cesium fluoride with elemental sulfur to give the thioketene dimer (5) and the trisulfane (6) (yield 21 % and 3 5% based on the alkene). Use of KF instead of CsF also produced some tetrasulfane analogous to (6). ... 

Previous methods for the preparation of sulfuryl fluoride have involved either the reaction of elemental fluorine with a variety of sulfur-oxygen compounds or the reaction of silver fluoride with sulfur dioxide. A very simple procedure for the preparation of sulfuryl fluoride in good yield involves the reaction of potassium fluorosulfite with chlorine gas. ... 

The formation of desaurins from ketones, carbon disulfide, and base 1275,1281,1282,1285-1290 believed to involve nucleophilic attack on a thioketene by the dianion of a 1,1-dimercaptoalkene, as shown for the synthesis of 572. Related syntheses involve the use of thiophosgene instead of carbon disulfide and the use of diazoalkanes or phosphonium and sulfonium ylides instead of a ketone and base. Treatment of perfluoroiso-butylene with fluoride ion and elemental sulfur in a dipolar, aprotic solvent ° °° or with sources of anionic sulfur (potassium sulfide, sodium hydrosulfide,potassium thiocyanate,sodium thiosulfate, dithiocarbamate salts, dithiophosphate salts ) give the dimer (573) of bis(trifIuoromethyl)-thioketene. Similarly, other 2,4-bis(methylene)-l,4-dithietanes are obtained by treating 2,2-dichlorovinyl ketones with anionic sulfur re-... 

CADMIO (Spanish) or CADMIUM (7440-43-9) Cd Air exposure, especially of powdered form, may cause chemical to self-ignite. Finely divided material reacts violently with strong oxidizers, fused ammonium nitrate, bromine pentafluoride, lithium, nitryl fluoride, phosphorus trichloride, potassium chlorate carbon dioxide + heat, hydrozoic acid (possible explosion), nitric oxide, tellurium. Contact with acid forms explosive hydrogen gas. Contact with hexafluorobenzene forms a heat-sensitive explosive compound. May react with selenium, elemental sulfur, zinc. On small fires, use dry chemical powder (such as Puiple-K-Powder), foam, Halon, or CO2 extinguishers. 

Sulfur Tetrafluoride. F4S mol wt 10S.07. F 70.33%, S 29.67%. SF4, First prepd from cobalt trifluoride and elemental sulfur Fischer, Jaenckner, Angew. Chetn. 42, 810 (1929) Kwasnik in Handbook of Preparative inorganic Chemistry vol. 1, G. Brauer. Ed. (Academic Press, New York, 2nd ed., 1963) pp 168-169- Best prepared from SCIj and NaF suspended in acetonitrile also from sulfur, chlorine and sodium fluoride Tullock et aL, J. Am. Chem. Soc. 82, 539 (I960) Arth, Fried, U.S. pat. 3,046,094 (1962 to Merck Co.) Fawcett, Tullock, Inorg. Sytt. 7, 119 (1963), Reviews of prepn and chemistry Smith, Angew. Chem. Ins Ed, 1, 467-475 (1962) Kemmitt, Sharp, Advan. Fluorine Chem. 4, 220-222 (1965) Martin, Ann. AT. Y. Acad. Sci. 145, 161-168 (1967). 

Sulfur(IV) fluoride has been prepared by fluorination of elemental sulfur with cobalt(III) fluoride or with elemental... 

The [SNS]+ ion was classically obtained by oxidation of a mixture of tetrasulfur tetfanitfide, S4N4, and elemental sulfur with AsFs as both the oxidant and fluoride-accepting Lewis acid ... 

Sulfur, Selenium and Tellurium Derivatives. TMSCF3 reacts with elemental sulfur, selenium or tellurium in the presence of a fluoride anion, leading to trifluoromethylthiolates, seleniates or tellurates, respectively.Aryltrifluoromethyl-sulfides, sulfoxides and sulfones were obtained from the corresponding arylsulfenyl, sulfinyl and sulfonyl halides, respectively, by treatment with TMSCF3 and TASF. The reaction of disulfides and diselenides with TMSCF3 and TBAF gave trifluoromethyl thioethers and selenoethers, respectively (eq 26). The same procedure can also be carried out from thiocyanates and selenocyanates. 

A number of mineral substances are gaseous at the magmatic temperatures of volcanoes and are mobilized with volcanic gases. These kinds of substances condense near the mouths of volcanic fiimaroles and are called sublimates. Elemental sulfur is a common sublimate. Some oxides, particularly of iron and silicon, are deposited as sublimates. Most other sublimates consist of chloride and sulfate salts. The cations most commonly involved are monovalent cations of ammonium ion, sodium, and potassium magnesium calcium aluminum and iron. Fluoride and chloride sublimates are sources of gaseous HF and HCl formed by their reactions at high temperatures with water, such as the following ... 

Oshima and coworkers have reported that treatment of tertiary alkyl fluorides with diphenylphosphine in the presence of a stoichiometric amount of BF3 OEt2 gives rise to the corresponding tert-alkyldiphenylphosphine tetrafluoroborate salts, which can be trapped by elemental sulfur to give the phosphine sulfides (144) (Equation 86) [88]. Remarkably, this reaction works despite the presence of the highly coordinating Lewis basic phosphine. 

Tantalum is a gray, heavy, and very hard metal. When pure, it is ductile and can be drawn into fine wire, which is used as a filament for evaporating metals such as aluminum. Tantalum is almost completely immune to chemical attack at temperatures below ISOoC, and is attacked only by hydrofluoric acid, acidic solutions containing the fluoride ion, and free sulfur trioxide. Alkalis attack it only slowly. At high temperatures, tantalum becomes much more reactive. The element has a melting point exceeded only by tungsten and rhenium. Tantalum is used to make a variety... 

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