Sulfur compounds fluorides

Sulfur and Sulfur Compounds, 123 Sulfur chloride, 123 Sulfur dioxide, 123 Sulfur hexafluoride, 123 Sulfur tetrafluoride, 124 Sulfur trioxide, 124 Sulfuric acid, 123 Sulfurous acid, 124 Sulfuryl fluoride, 124 Sulphamic acid, 124 Sulprofos, 124... 

When there is an a-hydrogen in the sulfide, the sulfuranes are unstable and cannot be isolated [775]. Sulfoxides [776] and sulfinyl fluorides [777] are oxidatively fluorinated with tluorine to give hexavalent sulfur compounds in yields up to 90%. 

In some instances, structural conclusions based on single-line resonances may be justified if there are supporting data. A case in point is that of the sulfur(VI)fluorides (89a). In the monomeric compound... 

Recently it has been shown that anhydrous hydrogen fluoride exerts a selective solvent action on sulfur compounds and can be used satisfactorily for the desulfurization of kerosenes. In some respects it behaves similarly to sulfuric acid. Points of difference, however, are that it does not oxidize mercaptans to disulfides and that it can be used over a wide temperature range, 30° to 150° F., without affecting results. Hydrogen fluoride does not yet seem to have been used in full scale commercial units. 

Organocopper reagents, 207 Organovanadium reagents, 219 By desilylation of vinylsilanes Tetrabutylammonium fluoride, 286 By desulfurization of vinyl sulfides and related sulfur compounds Sodium dithionite, 281 Elimination reactions By dehalogenation Dichlorobis(cyclopentadienyl)-titanium, 102... 

Selenium hexafluoride, SeFg, the only clearly defined hexahalide, is formed by reaction of fluorine with molten selenium, It is more reactive than the corresponding sulfur compound, SFs, undergoing slow hydrolysis. Selenium forms tetrahalides with fluorine, chlorine, and bromine, and dihalides with chlorine and bromine. However, other halides can be found in complexes, e.g,. treatment of the pyridine complex of SeF/i in ether solution with HBr yields (py)2SeBrc Selenium tetrafluoride also forms complexes with metal fluorides, giving MSeF complexes with the alkali metals. 

Hydrofluoric acid causes two types of corrosion, direct corrosion, in which iron fluoride is formed, and stress corrosion, in which the metal cracks. Electrolytic corrosion can also take place when the acid becomes diluted with water and two dissimilar metals or carbon are used. Because of the possibility of stress corrosion, all vessels in acid service must be stress-relieved. Monel is also subject to stress corrosion and must be stress-relieved. Care must be taken in stress-relieving Monel that sulfur or sulfur compounds do not come in contact with the Monel either before or during the heat treatment. 

Oxygen difluoride Combustible gases Perchloryl fluoride Hydrocarbons, etc. Silver bromate Sulfur compounds... 

This was the status of the chemistry of S20, F2 at the time of the last review in 1974 (152b) however, over the last 20 years this compound has dominated sulfur oxide fluoride chemistry. The method of preparation by the low-temperature electrolysis of dilute solutions ofKS03F in fluorosulfuric acid has been improved by increasing the concentration of the dissolved salt (153), and three new preparative routes have been... 

The most remarkable of the chalcogen halides is sulfur(Vl) fluoride, SF, which may be prepared directly from the elements. This compound is astoundingly inert to a multitude of diverse reagents. Concentrated... 

Perfluoroalkanesulfonyl fluorides and of related materials are manufactured by the electrochemical fluorination of the corresponding alkanesulfonyl fluorides or cyclic sulfonesP This electrochemical synthesis results in replacement of all C-H bonds in the feedstock. The perfluorinated alkanesulfonyl fluoride products are neutralized to make the anhydrous salt, then acidified and distilled to afford the anhydrous sulfonic acid. Alkyl chain degradation in the electrochemical cell becomes more pronounced at longer chain lengths. Addition of short-chain divalent sulfur compounds (e.g., thiols, sulfides) to the cell inhibits buildup of tarry materials and loss of efficiency. 

The general concept is that sulfur is introduced into the organic substrate as a direct synthetic precursor of fluorine. Tlte sulfur compound is then treated with a thiophilic, soft electrophilic oxidant, for example electrophilic halogenation agents (NBS, NIS, DBH, Br2, SO2CI2 [148], Fj [149], IF5 [150], BrFj [151], 4-MePhIF2 [152], or nitrosyl cations (NO BF., ) [146] in the presence of a fluoride source (50% or 70% HF-pyridine [143], HF-melamine [144], NEt3 3HF) [147]. 

A selection of the most important halides is show in Table 1 and routes to the preparation of sulfur compounds are shown in Fig. 1. With sulfur the fluorides are most stable and numerous, but Se and Te show an increasing range of heavier halides. Compounds such as S2C12 and S2F10 have S-S... 

Write chemical formulas for the following molecular compounds (a) sulfur tetra-fluoride, (b) dinitrogen pentoxide. 

The compound is a strong oxidant and is a versatile reagent for the preparation of other sulfur oxo fluorides 70 thus F2CO gives CF3OOS02F, while Br and 1 give X(S03F)4. ... 

In Germany, the actual maximum allowable concentration at the work place, called the MAK-values , for some sulfur compounds are sulfur dioxide (SO2) 0.5 mLm (1.3mgm ) carbon disulfide (CSj) 5 mLm (16mgm ) sulfur penta-fluoride (S2F10) 0.025 mLm (0.26 mgm ) sulfuric acid (only) 0.1 mgm and hydrogen... 

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