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Antimony hexafluoride anion

It is actually possible to observe this cationic intermediate. The trick is to pick a nonnucleophilic and nonbasic counterion X , such as antimony hexafluoride SbFg. In this octahedral anion, the central antimony atom is surrounded by the fluorine atoms and the negative charge is spread over all seven atoms. The protonation is carried out using FSO3H and SbFs at -120 °C. [Pg.551]

In addition to iodonium, sulfonium and selenonium compounds, onium salts of bromine, chlorine, arsenic, and phosphoras are also stable and can act as sources of cation radicals as well as Bronsted acids, when irradiated with light. Performance of diaryl chloronium and diaryl bromonium salts was studied by Nickers and Abu. Also, aryl ammonium and aryl phosphonium, and an alkyl aryl sulfonium salt were investigated. It appears that the general behavior of these materials is similar to diphenyl iodonium and triphenyl sulfonium salts. These are formations of singlet and triplet states followed by cleavages of the carbon-onium atom bonds and in-cage and out of cage-escape reactivity. The anions of choice appear to be boron tetrafluoride, phosphorus hexafluoride, arsenic hexafluoride, and antimony hexafluoride. [Pg.94]

How would we modify the reaction conditions so as to maximize the possibility of generating the carbocation and minimize the chances for its further reaction Antimony pentafluoride (SbFs) is an even stronger Lewis acid than AICI3 toward halogens, particularly fluorine. When SbFs removes a fluoride ion from an alkyl compound the anion antimony hexafluoride (SbFg ) is produced (Fig. 14.109).This anion is nonnucleophilic, and fluoride ion is a poor nucleophile as well. [Pg.679]


See other pages where Antimony hexafluoride anion is mentioned: [Pg.340]    [Pg.340]    [Pg.438]   


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