Triple C–H Bond Activation of a Nickel-Bound Methyl Group: Synthesis and X-Ray Structure of a Carbide Cluster (NiCp)<sub>6</sub>(μ<sub>6</sub>-C)
作者:Włodzimierz Buchowicz、Beata Herbaczyńska、Lucjan B. Jerzykiewicz、Tadeusz Lis、Stanisław Pasynkiewicz、Antoni Pietrzykowski
DOI:10.1021/ic3008409
日期:2012.8.6
Å, Ni···Ni nonbonding distances = 3.107(2) and 3.108(2) Å). Cluster 1 is the first example of a homoleptic, cyclopentadienylnickel carbidecluster. Moreover, 13C-labeling studies proved that the carbido ligand in cluster 1 originated from the Ni-bound methyl group. This transformation requires a triple C–H bond activation in the methyl group, which has not been observed so far for late transition metal
It has been shown that bis(cyclopentadienyl)(μ-cyclopentadiene)dinickel, (NiCP)2(η-C5H6), and (η5-cyclopentadienyl) (η3-cyclopentenyl)nickel, CpNi(η3-C5H7), are formed in the reaction of nickelocene with methyl-lithium and with 1-phenyl-2-methyl-propenyl-lithium. The compound (NiCp)2(μ-C5H6) can be only formed as a result of the reduction of the cyclopentadienylring bonded to the nickel atom whereas
已经显示的是双(环戊二烯基)(μ-环戊二烯)dinickel,(NICP)2(η-C 5 H ^ 6)和(η 5 -环戊二烯基)(η 3 -cyclopentenyl)镍,CPNI(η 3 -C在镍茂与甲基锂和1-苯基-2-甲基丙烯基锂的反应中形成5 H 7)。化合物(NICP)2(μ-C 5 H ^ 6)可以仅形成为结合到镍原子而CPNI的形成的减少的环戊二烯基环的结果(η 3 -C 5 ħ 7)可以通过在较早的反应步骤中形成的环戊二烯的进一步氢化来解释。(NICP)2(μ-C 5 H ^ 6)已被充分表征光谱测定其X-射线结构测定。它在正交系,空间群Pnma中结晶,每个晶胞有四个分子。
Reactions of nickelocene with lithium and magnesium alkyls containing β-hydrogen atoms1Dedicated to Professor Ken Wade on the occasion of his 65th birthday in recognition of his outstanding contributions to organometallic chemistry.1
The reaction of nickelocene with BrMgR, where R=CH2CH(CH3)C6H5, C2H5, (CH2)7CH3 and CH2CH2CH3, have been studied. It was found that the presence of β-hydrogen in R did not cause the total splitting of the carbon–nickel bond but alkylidynetrinickel clusters were formed. It is the first example of the synthesis of alkylidynetrinickel clusters (NiCp)3CR′ from the organonickel species possessing β-hydrogen
Nickelocene reacts with phenyllithium in the presence of terminal olefins to form (tris(η5-cyclopentadienyl) (μ3-alkylidyne)trinickel clusters (NiCp)3CR. It is a new, simple method for the synthesis of (μ3-alkylidyne)trinickel clusters with various R groups.
Reactions of nickelocene with diphenylmethyl- and triphenylmethyllithium
作者:Stanisław Pasynkiewicz、Antoni Pietrzykowski、Lidia Bukowska、Konrad Słupecki、Lucjan B Jerzykiewicz、Zofia Urbańczyk-Lipkowska
DOI:10.1016/s0022-328x(00)00275-8
日期:2000.6
Reactions of nickelocene with diphenylmethyl- and triphenylmethyllithium have been studied. Several organonickel compounds were formed in these reactions. The products were separated by column chromatography and characterised by spectral methods. The presence of alkylated nickelocenes among products of both reactions has been confirmed. The crystal structures of two π-allyl cyclopentadienylnickel complexes