Photoinduced Formal Gallylene Transfer from Gallium-Bridged Dimetallic Complexes to 16-Electron Metal Fragments
摘要:
Photoirradiation of the mixtures of Cp'(dppe)FeGaM(CO)(5) (Cp' = eta(5)-C5Me5 (Cp*), M = W (2), Cr (3); Cp' = eta(5)-C5H5 (Cp), M = W (5), Cr (6)) and Fe(CO)(5) in C6D6 caused formal gallylene transfer from 2, 3, 5, and 6 to the Fe(CO)(4) fragment to afford the gallium-bridged diiron complexes Cp'(dppe)FeGaFe(CO)(4) (Cp' = Cp* (1), Cp (4)) in moderate yields. Gallylene transfers with Cp(dppe)FeGaFe(CO)(4) (4) and M(CO)(6) (M = W, Cr) also took place to produce 5 and 6, respectively; however, that with Cp*(dppe)FeGaFe(CO)(4) (1) and M(CO)(6) did not proceed. Photoirradiation of 4 alone in toluene caused CO dissociation and dimerization to afford the gallylene-bridged tetrametallic complex {mu-Cp(dppe)FeGa}(2)Fe-2(CO)(6)(mu-CO) (8). In contrast to 4, the Cp* analogue 1 gave no gallylene-bridged complex in a similar reaction.