1,3,5-Triaza-7-phosphaadamantane (PTA) ligated iridium(I) complexes as catalysts for the intramolecular hydroamination of 4-pentyn-1-amine in water

The water-soluble complex [Ir(COD)(PTA)3]Cl (1, COD = 1,5-cyclooctadiene, PTA = 1,3,5-Triaza-7-phosphaadamantane) was prepared by the reaction of [IrCl(COD)]2 with PTA and is only one of the two [Ir(COD)P3]+ complexes to be structurally characterized as a square-pyramidal species. 1 and the related compounds, [IrCl(CO)(PTA)3] (2) and [Ir(CO)(PTA)4]Cl (3), were found to be active catalysts for the intramolecular hydroamination reaction in water.