Cp*GaCl 2 and Cp* 2GaCl (Cp*=η 1-C 5Me 5) as starting materials for novel Group 13 element complexes

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Reactions of Cp*GaCl 2 and Cp* 2GaCl (Cp*=η 1-C 5Me 5), respectively, with different carbonylmetalate anions are compared to yield the transition-metal–gallium complexes [(η 5-Cp*Ga)W(CO) 5] ( 1), [Fe 2(CO) 6{μ-(η 5-Cp*Ga)} 2{μ-(η 3-Cp*Ga)}] ( 2), [Ga{Mn(CO) 5} 3] ( 3), [Cp* 2Ga{Mn(CO) 5}] ( 4), [Co 2(CO) 6{μ-(η 5-Cp*Ga)} 2Co(CO) 3] ( 5) and [{(η 5-Cp)Fe(CO)} 2(μ-CO){μ 2-(η 5-Cp*Ga}] ( 6). The results show that both starting materials offer an alternative synthetic route to subvalent Cp*Ga(I) compounds via reductive dehalogenation reactions in comparison to the previously used reactions starting from Cp*Ga itself. Starting from Cp* 2GaCl, Cp* elimination reactions are observed additionally, a process which dominates much more in the case of Cp*InCl 2 as a starting material. In these reactions with [CpFe(CO) 2] − and [CpW(CO) 3] −, [In{CpFe(CO) 2} 3] ( 7) and [In{CpW(CO) 3} 3] ( 8), respectively, are obtained in good yield.