Crystal structures of tris(8-dimethylaminonaphthyl)phosphane and its hydrochloride salt. The first seven-coordinate phosphorus compound

The first seven-coordinate phosphorus compound, the hydrochloride salt of t ris(8-dimethylaminonaphthyl)-phosphane, is reported as a tricapped tetrahed ron with the nitrogen atoms acting as the capping ligands. It was synthesiz ed from the reaction of N,N-dimethyl-1-naphthylamine with butyllithium foll owed by treatment with phosphorus trichloride. Three carbon atoms, three ni trogen atoms, and a proton surrounded the phosphorus atom.