title: [Sb(C₆F₅)₄][B(C₆F₅)₄]: an air stable, Lewis acidic stibonium salt that activates strong element-fluorine bonds.
abstract: As part of our ongoing interest in main group Lewis acids for fluoride anion complexation and element-fluorine bond activation, we have synthesized the stibonium borate salt [Sb(C6F5)4][B(C6F5)4] (3). The perfluorinated stibonium cation [Sb(C6F5)4](+) present in this salt is a potent Lewis acid which abstracts a fluoride anion from [SbF6](-) and [BF(C6F5)3](-) indicating that it is a stronger Lewis acid than SbF5 and B(C6F5)3. The unusual Lewis acidic properties of 3 are further reflected by its ability to polymerize THF or to promote the hydrodefluorination of fluoroalkanes in the presence of Et3SiH. While highly reactive in solution, 3 is a perfectly air stable salt, making it a convenient Lewis acidic reagent.
authors.affiliation: Department of Chemistry, Texas A&M University , College Station, Texas 77843-3255, United States.
authors.forename: Baofei
authors.initials: B
authors.lastname: Pan
authors.forename: François P
authors.initials: FP
authors.lastname: Gabbaï