Complex ( 1 ) reacts with p -tolunitrile, benzonitrile, and p -chlorobenzonitrile to give the corresponding iminophosphine derivatives (R = CH 3 ( 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(sp 2 )−H bonds of the phosphine of 1 . Treatment of 2 − 4 with NaBH 4 and methanol produces the rupture of the P−C(CH 3 ) bond of the iminophosphine ligands and the formation of the respective osmapyrrole derivatives (R = CH 3 ( 5 ), H ( 6 ), Cl ( 7 )). The addition of HBF 4 ·Et 2 O to the diethyl ether solutions of 5 − 7 leads to the hydride-azabutadienyl-osmium(IV) complexes (R = CH 3 ( 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.
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Baya et al. (2005) studied this question.