CONTRIBUTIONS TO THE CHEMISTRY OF BROMINETRIFLUORIDE .2. BIS(PENTAFLUOROPHENYL)BROMONIUM CATIONS WITH WEAK NUCLEOPHILIC FLUOROELEMENTATE ANIONS

Citation
Hj. Frohn et al., CONTRIBUTIONS TO THE CHEMISTRY OF BROMINETRIFLUORIDE .2. BIS(PENTAFLUOROPHENYL)BROMONIUM CATIONS WITH WEAK NUCLEOPHILIC FLUOROELEMENTATE ANIONS, European journal of solid state and inorganic chemistry, 33(9), 1996, pp. 841-853
Citations number
21
Categorie Soggetti
Chemistry Inorganic & Nuclear
ISSN journal
09924361
Volume
33
Issue
9
Year of publication
1996
Pages
841 - 853
Database
ISI
SICI code
0992-4361(1996)33:9<841:CTTCOB>2.0.ZU;2-4
Abstract
BrF3 reacts with M(II)(C6F5)(2) (M = Zn, Cd, Hg) in organic solvents i ndependent of the stoichiometry under formation of C6F5BrF2. Bromonium compounds [(C6F5)(2)Br](+) [EF(n+1)](-) (E = Sb, As, B) are formed in equimolar reactions if additionally Lewis-acids EF(n) are present. [( C6F5)(2)Br](+) [BF4](-) results in quantitative yield independent of t he stoichiometry of substrates if BrF3 reacts with the Lewis-acidic ar yl transfer reagent (C6F5)(2)BF. The molecular structure of the bromon ium compounds [(C6F5)(2)Br](+) [BF4](-) and [(C6F5)(2)Br](+) [AsF6](-) can be interpreted in terms of two asymmetric hypervalent bonds at br omine(III). Ln solution the electrophilicity of Br(III) in [(C6F5)(2)B r](+) [EF(n+1)](-) is responsible for the strong dependence of the F-1 9 NMR shift values from the nucleophilicity of the solvent.