Synthesis and Lewis acidity of fluorophosphonium cations
Synthesis and Lewis acidity of fluorophosphonium cations
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DOI：
10.1039/c5dt00217f
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发表时间：
2015-01-01
影响因子：
4
通讯作者：
Stephan, Douglas W.
中科院分区：
文献类型：
--
作者：
Caputo, Christopher B.;Winkelhaus, Daniel;Stephan, Douglas W.
通过膦/硼烷受阻路易斯对 (FLP) 与 XeF2 或二氟正膦与 [Et3Si][B(C6F5)(4)] 反应制备了一系列氟鏻盐 [R3PF][X]（R = 烷基或芳基；X = FB(C6F5)(3), [B(C6F5)(4)]）。随着与磷结合的取代基越来越吸电子，相应的氟鏻盐显示出越来越路易斯酸性。还进行了计算以确定这些氟鏻阳离子的相对氟离子亲和力 (FIA)。
A series of fluorophosphonium salts, [R3PF][X] (R = alkyl or aryl; X = FB(C6F5)(3), [B(C6F5)(4)]), have been prepared by reactions of phosphine/borane frustrated Lewis pairs (FLPs) with XeF2 or difluorophosphoranes with [Et3Si][B(C6F5)(4)]. As the substituents bound to phosphorus become increasingly electron withdrawing, the corresponding fluorophosphonium salts are shown to be increasingly Lewis acidic. Calculations were also performed to determine the relative fluoride ion affinities (FIA) of these fluorophosphonium cations.