Antimony penta fluoride

We may seem to have contradicted ourselves because Equation 10-1 shows a carbocation to be formed in bromine addition, but Equation 10-5 suggests a bromonium ion. Actually, the formulation of intermediates in alkene addition reactions as open ions or as cyclic ions is a controversial matter, even after many years of study. Unfortunately, it is not possible to determine the structure of the intermediate ions by any direct physical method because, under the conditions of the reaction, the ions are so reactive that they form products more rapidly than they can be observed. However, it is possible to generate stable bromonium ions, as well as the corresponding chloronium and iodonium ions. The technique is to use low temperatures in the absence of any strong nucleophiles and to start with a 1,2-dihaloalkane and antimony penta-fluoride in liquid sulfur dioxide ... 

Sulfur can be quantitatively oxidized by arsenic or antimony penta-fluoride to red compounds of composition Sig(AsFg)2 and Sig(SbFg)2 or to the deep blue compounds, Se(AsFg)2 and Sg(Sb2Fii)2 according to Eq. (26)-(29). In addition the pale yellow compound S4(SbFg)2 has been... 

Some cycloaddition reactions of oxaziridine 59 with halogenated alkenes have been reported along with reactions with trimethylsilyl cyanide and antimony penta-fluoride. A related cycloaddition of oxaziridine 94 with hexafluoroacetone has been reported. 

Antimony Penta- fluoride Not flammable Not flammable Not flammable Not flammable Not pertinent Water or foam on adjacent fires. Irritating fumes of hydrogen chloride given off when water or foam is used to extinguish adjacent fire Not pertinent Reacts to form hydrogen fluoride gas (hydrofluoric acid) ... 

Trimethylcarbenium fluoroantimonate, (Cf )jCSbFj. This relatively stable salt can be prepared as light-colored crystals by the reaction at -70° of (CH3)3CC1 with fluoroantimonic acid (HF SbFs) or with antimony penta-fluoride in sulfuryl chloride fluoride, CISO2F. It is stable at 20°, but decomposes at room temperature. 

Methyl-a,d-cthylenic sulfoxides, 377 Methyl farncsoate, 448 Methyl fluoride-Antimony penta-fluoride-Sulfur dioxide, 381 Methyl tluorosulfonate, 26, 48, 381-382 Methyl geraniate, 447 Methyl gibberellate, 186 Methyl a-D-glucopyranoside, 26 (3-Methyl glycopyranosides, 437, 438 Methyl 18a-glycyrrhetate, 501... 

For the most part the stable ion media developed by Olah are based on antimony penta-fluoride, SbFs. This is a very powerful Lewis acid, and exposure of an alkyl halide to it produces a carbocation with the SbaFioX counterion, as in Eq. 2.16. The counterion to is very... 

In addition to the trihalides, arsenic and antimony form penta-fluorides and antimony a pentachloride it is rather odd that arsenic pentachloride has not yet been prepared. 

Antimony, arsenic, selenium, tellurium, iridium, iron, molybdenum, osmium, potassium, rhodium, tungsten (and when primed with charcoal,) aluminium, copper, lead, magnesium, silver, tin, zinc. Interaction of lithium or calcium with chlorine tri- or penta-fluorides is hypergolic and particularly energetic. 

HF In die presence of fluorinating agents, such. as antimony tri- and penta-fluorides. Used as aerosol propint, refrigerant and fire extinguisher... 

Assuming covalent bonds, write electronic structures for the molecules GIF (chlorine fluoride), BrFg (bromine trifluofide), SbCl5 (antimony penta chloHde), HgSg (hydrogen disulfide). In which of these molecules are there atoms with electron configurations that are not noble-gas configurations ... 

ETHYL PHOSPHATE (78-40-0) Combustible liquid (flash point 210 F/99°C cc). Slow decomposition in water. Violent reaction with strong oxidizers, antimony(V) penta-fluoride. Incompatible with strong acids, lead diacetate, magnesium, nitrates, silver nitrate. 

The most important means of introducing fluorine into aliphatic compounds is the HF substitution of aliphatic chlorides in the presence of pentavalent antimony salts. A common procedure is to add carbon tetrachloride to a stainless-steel autoclave, then introduce antimony penta-chloride, chlorine, and hydrogen fluoride. The autoclave is closed and heated to 100°C until reaction is complete. HCl must be vented at intervals to keep the pressure down to 30 atm. 

The liquid phase reactions for the produetion of HFC-32 involves the reaetion of diehloiomethane with hydrogen fluoride in presenee of antimony penta-ehloride/tinchloride or titanium tetraehloride [49], antimony pentaehloride, [50,51], SbCljFj [52] and tin ehloride [53] as indicated in Fig. 11.5. The reaetion temperature are in the range of 50-150°C and pressure is in the range of 6-60 atmospheres. 

Swarts reaction. Fluorination of organic polyhalides with antimony trifluoride (or zinc and mercury fluorides) in the presence of a trace of a penta-valent antimony salt. 

The direct chlorination of chlorosulfonyl isocyanate (I) to chloro-sulfonylcarbonimidoyl dichloride (II) by means of phosphorus penta-chloride has been reported f ). However, severe conditions are required and the yield is low. Selective fluorination of II with antimony trifluoride produces the sulfonyl fluoride III (" ). 

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