摘要:
The diiron bridging enaminoalkylidene complex [Fe-2{mu-eta(1):eta(3)- C(Fc)CHCH(NMe2)}(mu-CO)(CO)-(Cp)(2)] (2), containing a ferrocenyl group on the bridging ligand, reacts with HC CR, affording the corresponding 3-R- substituted 1,1 ''-biferrocene (R = CPh2OH, 4a; R = Tol, 4b; R = CO2Me, 4c; R = CH2OH, 4d). In a related reaction, the mu-vinylaminoalkylidene complex [Fe-2{mu-eta(1):eta(3)-C-(NMe2)CHCH(CO2Me)}(mu-CO)(CO)(Cp)(2)] (1a), upon treatment with ethynylferrocene, leads to the formation of 2-NMe2-4-CO2Me- 1,1 ''-biferrocene (4f). Conversely, the mu-enaminoalkylidene complex [Fe-2{mu- eta(1):eta(3)-C(Tol)CHCH(NMe2)}(mu-CO)(CO)(Cp)(2)] (1b) reacts with ethynylferrocene, affording a mixture of monosubstituted biferrocene 4b and disubstituted 2-NMe2-4-Tol-1,1 ''-biferrocene (4e), in comparable yields. Reaction of 2 with ethynylferrocene (HC CFc) leads to the formation of a mixture of 1,3-terferrocene (5a) and the 5-NMe2-substituted 1,3-terferrocene (5b). Investigation of the reactivity of the vinyliminium complex [Fe-2{mu-eta(1):eta(3)-C(Fc)CHCNMe2}(mu-CO)-(CO)(Cp)(2)][SO3CF3] (3) with HC CCPh2OH is also reported: the reaction affords selectively the 3-NMe2-4-R-disubstituted 1, 1 ''-biferrocene (6). The molecular structure of 5a has been determined by X-ray diffraction studies.