874883-71-3Relevant academic research and scientific papers
Synthesis, characterization and reactivity of tribenzylphosphine rhodium and iridium complexes
Landaeta, Vanessa R.,Peruzzini, Maurizio,Herrera, Verónica,Bianchini, Claudio,Sánchez-Delgado, Roberto A.,Goeta, Andrés E.,Zanobini, Fabrizio
, p. 1039 - 1050 (2007/10/03)
New rhodium and iridium complexes, with the formula [MCl(PBz 3)(cod)] [M = Rh (1), Ir (2)] and [M(PBz3) 2(cod)]PF6 [M = Rh (3), Ir (4)] (cod = 1,5-cyclooctadiene), stabilized by the tribenzylphosphine ligand (PBz 3) were synthesized and characterized by elemental analysis and spectroscopic methods. The molecular structures of 1 and 2 were determined by single-crystal X-ray diffraction. The addition of pyridine to a methanol solution of 1or 2, followed by metathetical reaction with NH4PF 6, gave the corresponding derivatives [M(py)(PBz3)(cod)] PF6 [M = Rh (5), Ir (6)]. At room temperature in CHCl3 solution, 4 converted spontaneously to the ortho-metallated complex [IrH(PBz3)(cod){η2-P,C-(C6H 4CH2)PBz2}]PF6 (7) as a mixture of cis/trans isomers via intramolecular C-H activation of a benzylic phenyl ring. The reaction of 3 or 4 with hydrogen in coordinating solvents gave the dihydrido bis(solvento) derivative [M(H)2(S)2(PBz3) 2]PF6 (M = Rh, Ir; S = acetone, acetonitrile, THF), that transformed into the corresponding dicarbonyls [M(H)2(CO) 2(PBz3)2]PF6 by treatment with CO. Analogous cis-dihydrido complexes [M(H)2(THF)2(py) (PBz3)2]PF6 (M = Rh, Ir) were observed by reaction of the py derivatives 5 and 6 with H2.
