Abstract Formation of complexes between phosphorus halides and 4-dimethylaminopyridine or N-methylimidazole was studied. The following phosphorus halides: trichloride, oxychloride, and sulfochloride, were found to form equilibrium mixtures of the complexes containing different numbers of the ligand molecules. Among the studied phosphorus halides only pentachloride and tribromide form stable complexes with a constant ...
