Synthesis and Lewis acidity of fluorophosphonium cations
作者:Christopher B. Caputo、Daniel Winkelhaus、Roman Dobrovetsky、Lindsay J. Hounjet、Douglas W. Stephan
DOI:10.1039/c5dt00217f
日期:——
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
通过以下反应制备了一系列氟phosph盐[R 3 PF] [X](R =烷基或芳基; X = FB(C 6 F 5)3,[B(C 6 F 5)4 ])。 XeF 2使膦/硼烷受阻的路易斯对(FLP)或具有[Et 3 Si] [B(C 6 F 5)4 ]的二氟正膦。随着与磷结合的取代基变得越来越吸电子,相应的氟phosph盐显示出越来越路易斯酸性。还进行了计算以确定这些氟phosph阳离子的相对氟离子亲和力(FIA)。