[Sb(C6F5)4][B(C6F5)4]: An Air Stable, Lewis Acidic Stibonium Salt That Activates Strong Element-Fluorine Bonds

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• 作者：Baofei Pan ; Fran莽ois P. Gabba茂
• 刊名：Journal of the American Chemical Society
• 出版年：2014
• 出版时间：July 9, 2014
• 年：2014
• 卷：136
• 期：27
• 页码：9564-9567
• 全文大小：273K
• ISSN：1520-5126

文摘

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]^{鈭?/sup> and [BF(C₆F₅)₃]鈭?/sup> 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.}