849116-06-9Relevant articles and documents
Formation of azabutadienyl fragments by addition of the isopropenyl substituent of a phosphine to benzonitriles, promoted by an osmium center
Baya, Miguel,Esteruelas, Miguel A.,Gonzalez, Ana I.,Lopez, Ana M.,Onate, Enrique
, p. 1225 - 1232 (2005)
Complex Os(η5-C5H5) Cl{[η2-CH2=C(CH3)]PiPr 2} (1) reacts with ρ-tolunitrile, benzonitrile, and ρ-chlorobenzonitrile to give the corresponding iminophosphine derivatives Os(η5-C5H5)-Cl{NH=C(ρ-C 6H4R)CH=C(CH3)PiPr2} (R = CH3 (2), H (3), Cl (4)), as a result of the insertion of the carbon-nitrogen triple bond of the nitriles into one of the C(sp2)-H bonds of the phosphine of 1. Treatment of 2-4 with NaBH4 and methanol produces the rupture of the P - C(CH3) bond of the iminophosphine ligands and the formation of the respective osmapyrrole derivatives Os(η5-C5H5){NH-C(ρ-C6H 4R)-CH-C(CH3)}(PHiPr2) (R = CH 3 (5), H (6), Cl (7)). The addition of HBF4-Et 2O to the diethyl ether solutions of 5-7 leads to the hydride-azabutadienyl-osmium(IV) complexes [OsH(η5-C 5H5){NH=C(ρ-C6H4R)CH=C-(CH 3)}(PHiPr2)]BF4 (R = CH3 (8), H (9), Cl (10)), as a consequence of the protonation of the metallic center of 5-7. Complexes 3 and 10 have been characterized by X-ray diffraction analysis.