Synthesis of a Small Cyclic Frustrated Phosphane/Borane Lewis Pair

^§ X-ray crystal structure analysis

Dedicated to Professor Dieter Enders on the occasion of his 70^th birthday

Abstract

Treatment of pyrrolidinodivinylphosphane with three molar equivalents of bis(pentafluorophenyl)borane resulted in the formation of a bicyclic pyrrolidino-bridged P/B frustrated Lewis pair (FLP) derivative, isolated as its P–[HB(C₆F₅)₂] adduct. The system can be converted into an unbridged cyclic P/B frustrated Lewis pair derivative by the addition of pyridine.

Key words

frustrated Lewis pair - hydroboration - boron - phosphorus - heterocycle

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