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The reactivity of carbonyl iron cluster with alkynes has been studied by the thermal reaction of Fe_3(CO)_(12) with R-C≡C-R’(R = Fc(Ferrocenyl); R′ = Ph(Phenyl), Fc, H). The hexacarbonyldiiron cluster with ferracyclopentadiene ring(μ_2, η~4-C_4Ph_4)Fe_2(CO)_6(1) and one tetraphenyl substituted cyclopentadienone(Ph_4C_4CO)(2) were simultaneously obtained by the reaction of Fe_3(CO)_(12) with alkyne(Ph-C≡C-Ph). Only one ferrole cluster(μ_2, η~4-C_4Fc_2H_2)Fe_2(CO)_6(3) was separated by using Fc-C≡C-H as alkyne. One tri-carbonyl iron complex(η~4-C_4Fc_4CO)Fe(CO)_3(4) and an unexpected new cyclic ketone compound 2,2,4,5-tetraferrocenylcyclopenta-4-en-1,3-di-one [Fc_4C_3(CO)_2](5) were obtained by using Fc-C≡C-Fc as alkyne. A new complex(η4-2,4-diphenyl-3,5-diferrocenylcyclopenta-2,4-dien-1-one)-tricarbonyl iron(η~4-C_4Ph_2Fc_2CO)Fe(CO)_3(6) was synthesized by the reaction of Fe_3(CO)_(12) with Fc-C≡C-Ph. The structures of compounds 1~6 were determined by X-ray single-crystal diffraction and spectroscopic characterization. The crystal structures of two new compounds 5 and 6 were analyzed. Our experimental results reveal the structural models of the reaction products are affected by the kinds of substituents from alkynes R-C≡C-R′.
The reactivity of the carbonyl iron cluster with alkynes has been studied by the thermal reaction of Fe_3 (CO) _ (12) with RC≡C-R ’(R = Fc (Ferrocenyl) The hexacarbonyldiiron cluster with ferracyclopentadiene ring (μ_2, η~4-C_4Ph_4) Fe_2 (CO) _6 (1) and one tetraphenyl substituted cyclopentadienone (Ph_4C_4CO) (2) were also obtained by the reaction of Fe_3 (CO) With one-ferrole cluster (μ_2, η ~ 4-C_4Fc_2H_2) Fe_2 (CO) _6 (3) was separated by using Fc-C≡CH as alkyne. One tri-carbonyl Iron complex (η ~ 4-C_4Fc_4CO) Fe (CO) _3 (4) and an unexpected new cyclic ketone compound 2,2,4,5-tetraferrocenylcyclopenta-4-en-1,3-di-one [Fc_4C_3 (CO) 2] (5) were obtained by using Fc-C≡C-Fc as alkyne. A new complex (η4-2,4-diphenyl-3,5-diferrocenylcyclopenta-2,4-dien-1-one) (η ~ 4-C_4Ph_2Fc_2CO) Fe (CO) _3 (6) was synthesized by the reaction of Fe_3 (CO) _ (12) with Fc-C≡C-Ph. The structures of compounds 1-6 were determined by X- ray single-cry The experimental results reveal the structural models of the reaction products are affected by the kinds of substituents from alkynes R-C≡C-R ’.