Synthesis and Lewis Acidity of Fluorophosphonium Cations

Overview

Journal Dalton Trans

Publisher Royal Society of Chemistry

Specialty Chemistry

Date 2015 Mar 19

PMID 25785571

Citations 10

Authors

Christopher B Caputo

Daniel Winkelhaus

Roman Dobrovetsky

Lindsay J Hounjet

Douglas W Stephan

Affiliations

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Abstract

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.

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