Phosphonium salts and P-ylides

The review collects and describes the literature on the preparation, characterisation and applications of phosphonium salts and ylides for the period January–December 2018. For the Reader's convenience, topics are organized to offer an introductory survey on the methods of preparation and characterisation of both types of compounds, followed by an analysis of applicative and curiosity driven research. A special section is devoted to phosphonium-based ionic liquids (PILs).