Small Cyclopolyphosphinophosphonium Cations: Systematic Development of Fundamental <i>catena</i>‐Phosphorus Frameworks

Abstract

Methylation or phosphenium insertion reactions with cyclopolyphosphines (PtBu)3 or (PCy)4 (Cy=cyclohexyl) are presented as stereospecific and high-yielding preparative approaches to cyclopolyphosphinophosphonium cations. The cations [(PtBu)3Me]+, [(PCy)4Me]+, and [(PtBu)3PMe2]+ (see picture; P orange, C gray) are prepared as trifluoromethanesulfonate salts and represent key frameworks in fundamental catena-phosphorus chemistry.