Phosphonium Salts and Phosphine Chalcogenides

Organophosphorus Chemistry, Volume 35 The Royal Society of Chemistry, 2006 

As is usual, phosphonium cations have been used to stabilise unusual anions. The salt (Ph4P)2HP7, involving the hydrogenheptaphosphide anion, has been prepared as an ammonia solvate from the reaction of K3P7 with tetra-phenylphosphonium bromide in liquid ammonia, and characterised by low-temperature X-ray structural analysis. The reaction between the cyclic 

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The chemistry of phosphonium salts and phosphine chalcogenides has also continued to develop, although no major advances have appeared, doubtless reflecting the maturity of the area. 

One-pot transformations of phosphine boranes into phosphonium salts and phosphine chalcogenides. 

The chemistry of phosphine chalcogenides, phosphonium salts and ylides has also continued to develop and activity in this area remains at a high level. Of note is a growing literature on the use of phosphonium-based ionic liquids as solvents. 

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