Phosphine-Catalyzed Synthesisof Unsymmetrical 1,3-Bis- and Trisphosphorus Ligands

Phosphine-catalyzed umpolung γ-additions of phosphorus pronucleophiles on alkynes bearing phosphinoyl (P=O) or phosphinothioyl (P=S) moieties have been explored. The reaction leads to bis- or trisphosphorus subunits that can be useful for the preparation of chelating ligands.