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Iron-Fragment-Substituted Heterosiloxanes of Gallium [Cp(OC)2Fe−SiR2OGaR′2]2 (R, R′ = Alkyl, Aryl) − Structures of [Cp(OC)2Fe−SiR2OGaMe2]2 (R = Me, Ph)



The trialkylgallanes GaR′′3 [R′ = Me, iPr (2a and 2b)] react with the ferrio-silanols Cp(OC)2Fe−Si(R)(R′)OH [R = R′ = Me, iPr, Ph (1a−c), R = Me, R′ = Ph (1d)] by alkane elimination to yield the iron-substituted siloxy-gallanes [Cp(OC)2Fe−Si(R)(R′)OGaR′′2]2 (3ae). According to molecular mass determination in benzene (3a, 3b, 3d), X-ray analyses (3a, 3d) and NMR spectroscopy (3e), the novel hetero-siloxanes exist as dimers both in solution and in the solid state. The bonding situation and geometry of the ferrio-heterosiloxane [Cp(OC)2Fe−SiH2OGaH2]2 has been analyzed by density functional calculation. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)