New rhodium(I) and iridium(I) complexes containing mixed pyrazolyl-1,2,3-triazolyl ligands as catalysts for hydroamination

Abstract

Two new bidentate pyrazolyl-triazolyl donor ligands, 4-((1H-pyrazol-1-yl) methyl)-1-benzyl-1H-1,2,3-triazole, PyT (1a), and 4-((1H-pyrazol-1-yl)methyl)-1- phenyl-1H-1,2,3-triazole, PyS (1b), were synthesized using the copper(I)-catalyzed "click" reaction between 1-propargylpyrazole and benzyl azide or phenyl azide, respectively. Cationic rhodium(I) and iridium(I) complexes containing the new N-N′ ligands of the general formulas [M(N-N′)(COD)]X (M = Rh or Ir, N-N′ = PyT or PyS, and X = BPh 4 - or BAr F 4 - (tetrakis[3,5-bis(trifluoromethyl)phenyl]borate) 2a-c for Rh and 3a-c for Ir) and [M(N-N′)(CO) 2]X (M = Rh or Ir, N-N′ = PyT or PyS, and X = BPh 4 - or BAr F 4 -4a-d for Rh and 5a-d for Ir)..