Reactions of transition-metal vapours with cycloheptatriene and cyclo-octatetraene
作者:Peter L. Timms、Terence W. Turney
DOI:10.1039/dt9760002021
日期:——
The co-ordination of cycloheptatriene in reactions with transition-metal atoms in the condensed phase at low temperature is accompanied by extensive hydrogen migration. Thus, condensation of C7H8 with the vapours of Ti, V, Cr, Fe, and Co affords [Ti(η-C7H7)(η5-C7H9)], V(C14H16), [Cr(η-C7H7)(η4-C7H10)], [Fe(η5-C7H7)(η5-C7H9)] or FeC14H18, and CoC14Hn(n= 15, 17, or 19) respectively. No organometallic
环庚三烯在低温下与缩合相中过渡金属原子的反应配位伴随着大量的氢迁移。因此,C的缩合7 ħ 8与钛,钒,铬,铁,和Co得到钛[Ti(η-C的蒸气7 ħ 7)(η 5 -C 7 ħ 9)],V(C 14 ħ 16),[CR(η-C 7 H ^ 7)(η 4 -C 7 ħ 10)],[铁(η 5 -C 7 ħ 7)(η 5 -C 7 ħ 9)]或FeC 14 H 18和CoC 14 H n(n = 15、17或19)。尚未从Mn,Ni或Pd的蒸气中分离出任何有机金属产物。PF 3 -C 7 H 8混合物与Cr或Co蒸气的缩合分别提供[Cr(C 7 H 8)(PF 3)3 ]或[Co(C 7 H 7)(PF 3)3 ]。C 8 H 8与Ti,Fe和Co蒸气的缩合产生难处理的聚合物,但与铬蒸气[Cr 2得到(C 8 H 8)3 ]。将金属原子在烯烃金属配合物中的制备与常规还原方法进行了比较。
Reaction of Chromium(III) Chloride with the Cycloheptadienyl Anion: Susceptibility of Edge Bridges To C−H Activation Reactions
作者:Rehan Basta、Atta M. Arif、Richard D. Ernst
DOI:10.1021/om020991k
日期:2003.2.1
The reaction of CrCl3 with 3 equiv of the cycloheptadienyl anion leads to Cr(eta(7)-C7H7)(eta(4)-C7H10) (C7H10 = cycloheptadiene), through a process in which one ligand loses two hydrogen atoms while the other ligand gains one. The same complex had been reported from an entirely different route, involving the reaction of chromium(III) salts with Grignard reagents in the presence of cycloheptadiene and cycloheptatriene. The formulation of the complex has been confirmed by a low-temperature X-ray diffraction study. Related reactions have been found to lead to M(eta(7)-C7H7)(eta(5)-C7H9) (M = Ti, V; C7H9 = cycloheptadienyl) complexes. The preferential formation of one aromatic eta(n)-CnHn ligand seems to provide the driving force favoring the isolated products and related species having other values of n.
Cycloheptatrienyl-chrom(-I)-cycloheptadien-(1,3)
作者:Ernst Otto Fischer、Arno Reckziegel、Jörn Müller、Peter Göser