Stannyl Complexes of Rhodium and Iridium: Preparation of Mono- and Bis(trihydridestannyl) Derivatives

Mono- and bis(trichlorostannyl) complexes [MCl(SnCl3)(η5-C5Me5)P(OR)3] (1, 2) and [M(SnCl3)2(η5-C5Me5)P(OR)3] (3, 4) (M = Rh, Ir; R = Me, Et) were prepared by allowing chloro compounds MCl2(η5-C5Me5)[P(OR)3] to react with anhydrous SnCl2 in refluxing 1,2-dichloroethane. Treatment of trichlorostannyl complexes of iridium 2 and 4 with NaBH4 in ethanol afforded hydride-trihydridestannyl derivatives [IrH(SnH3)(η5-C5Me5)P(OR)3] (5) and bis(trihydridestannyl) [Ir(SnH3)2(η5-C5Me5)P(OR)3] (6), the reaction of which with methylpropiolate HC≡CCOOMe led to trivinylstannyl derivatives [IrHSn[C(COOMe)=CH2]3(η5-C5Me5)P(OMe)3] (7 a) and [IrSn[CH=C(H)COOMe]32(η5-C5Me5)P(OMe)3] (8 a). The complexes were characterised spectroscopically (IR and 1H, 31P, 13C, 119Sn NMR) and by X-ray crystal structure determination of [Ir(SnCl3)2(η5-C5Me5)P(OMe)3] (4 a).