Phosphonium salts and P-ylides
This review collects and describes the literature published between January and December 2019, focusing on the preparation, characterisation and applications of phosphonium salts and ylides. The large number of reviewed references highlights the importance of P-based derivatives in synthetic and non-synthetic applications. For the Reader's convenience, topics are organized to offer an introductory survey of the methods of preparation and characterisation of both types of compounds, followed by an analysis of applicative and curiosity-driven research. Recent advances on the synthesis and applications of phosphonium-based ionic liquids (PILs) are summarised in a dedicated section.