[Cr(eta(5)-C5H4Li)(eta(7)-C7H6Li)]2 x (thf)8, where the C5H4 moieties of both units are connected by two bridging lithium atoms. Addition of different element dihalides to the dilithio precursor facilitated the isolation of ansa complexes with boron and germanium in the bridging position. Structural characterization by X-ray diffraction studies on [Cr(eta(5)-C5H4)-BN(SiMe3)2-(eta(7)-C7H6)] and [Cr(eta(5)-C
杂配夹心复合物 [Cr(eta(5)-C5H5)(eta(7)-C7H7)](三氯苯)是通过随后在环庚三烯存在下用 NaCp 和 Mg 处理 CrCl3 制备的,产率为 40%。采用 tBuLi/tmeda(N、N、N'、N'-四甲基乙二胺)的选择性二金属化提供了高活性物质 [Cr(eta(5)-C5H4Li)(eta(7)-C7H6Li)] x tmeda。对其 thf 溶剂化物的 X 射线晶体结构测定揭示了固态的对称二聚体组成,即 [Cr(eta(5)-C5H4Li)(eta(7)-C7H6Li)]2 x (thf)8,其中两个单元的 C5H4 部分由两个桥接锂原子连接。向二锂前体中添加不同的二卤化物元素促进了在桥接位置具有硼和锗的 ansa 复合物的分离。通过 X 射线衍射研究 [Cr(eta(5)-C5H4)-BN(SiMe3)2-(eta(7)-C7H6)] 和 [Cr(eta(5)-C5H4)-GeMe2-(
Organochromium π-complexes—VII. The reactions of Cp(η3-allyl)2Cr compounds with alkynes and alkenes
The compounds (eta-RC5H4)(eta3-C3H5)2Cr (R = H, Me, t-C4H9) and (eta5-indenyl)(eta3-C3H5)2Cr react with alkynes (RC2R) with displacement of 1,5-hexadiene to give Cp'(eta6-R6C6)Cr species. Treatment with cyclooctatetraene gives compounds containing an eta6-C8H8 group while the final product of the reaction with cycloheptatriene contains an eta7-cycloheptatrienyl fragment. 1,3-Butadiene reacts with dimerization to give the diamagnetic, dinuclear species (Cp'Cr)2(mu-eta3,eta3-C8H12). The molecular structures Cp(eta6-Me6C6)Cr, (eta5-indenyl)(eta6-Me6C6)Cr and Cp(eta6-C8H8)Cr have been confirmed by X-ray diffraction.
Organometallic Chemistry of the Transition Metals. VI. Some Cycloheptatrienyl Derivatives of Chromium, Molybdenum, and Cobalt
Synthesis ofansa-[2]Boracyclopentadienylcycloheptatrienylchromium and Its Reaction to theansa-Platinabis(boryl) Complex by Oxidative Addition of the BoronBoron Bond