The Reaction of Cyclopropenylphosphonium Bromides with Sodium Polyphosphides as an Advanced Method of Synthesis of Sodium 1,2-Diphosphacyclopentadienides: Scope and Limitations

Abstract

A new ring expansion reaction based on the interaction between 1,2,3-triarylcyclopropenylphosphonium bromide (1) and sodium polyphosphides gives sodium 3,4,5-triaryl-1,2-diphosphacyclopentadienides (2) containing various substituents in the para-position of the aryl groups with a high yield. However, this reaction of trialkylcyclopropenylphosphonium bromide (i.e., tri(tert-butyl)- or triisopropylcyclopropenylphosphonium bromide) does not result to the formation of sodium 1,2-diphosphacyclopentadienides.

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Keywords:

• Phosphonium bromide
• sodium 1,2-diphosphacyclopentadienides
• sodium polyphosphides