氢化锆(C 5 H 5)2 Zr(H)Cl通过跨三键添加Zr-H与单和二取代的乙炔反应。尽管在某些情况下会形成异构体的混合物,但通常会得到反式链烯基衍生物。对于单取代的乙炔(C 5 H 5)2, ZrH 2的行为类似,给出了二(反式-链烯基)锆化合物,但对于二芳基乙炔,则放出了氢,并生成了四芳基丁二烯络合物。
Intramolecular Cyclization of Dinitriles via Zirconocene(IV)−Phosphorus Exchange Reactions: Synthesis of σ<sup>3</sup>,λ<sup>3</sup>-1-Phospha- and σ<sup>3</sup>,λ<sup>3</sup>-1,4-Diphospha-2,6-diazines
Dinitrile cyclization reactions leading to new six-membered heterocycles 1-σ3,λ3-phospha-2,6-diazines 3a,b and 1,4-σ3,λ3-diphospha-2,6-diazines 6, 7, and 8 are presented. These syntheses involve dinitrile derivatives, Schwartz reagent [Cp2ZrHCl]n, and phosphorus compounds as promoted cyclization reagents. An X-ray crystal structure of the 1,4-σ3,λ3-diphospha-2,6-diazine 8 is reported.
A novel method for the preparation of heterogeneous metallocene catalysts is described that can be applied for the polymerization of olefins starting with homogeneous metallocene complexes. For this purpose zirconocene dichloride complexes have been prepared containing alkenyl or alkynyl substituents. These complexes can be activated with methyl alumoxane (MAO) and then are incorporated as comonomers
σ-propynyl group from zirconium to boron followed by insertion of the alkynylborate triple bond into the zirconium carbon bond of the remaining metallaallyl cation to furnish the zirconocene–(μ-hydrocarbyl)borate betaine complex 14. This reacts with three molar equivalents of tert-butyl isocyanide to give 16. Complex 16 contains a five-membered carbocyclic ring, formed by carbon-carboncoupling of the former
The three-membered metallacyclic structure of (η<sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)<sub>2</sub>ZrCl-substituted dimethyl ether
作者:Gerhard Erker、Rüger Schlund、Carl Krüger
DOI:10.1039/c39860001403
日期:——
The title compound cp2Z[graphic omitted]Me (3)(cp =η5-C5H5) was prepared by treating cp2ZrCl2 with MeOCH2MgCl in CH2(OMe)2; a three-membered metallacyclic onium-type structure was observed by X-ray diffraction.
Misdirected π-donor ligands: (η5-C5H5)2Zr(Cl) (SR) with sterically more demanding R groups have lower rotational barriers
作者:Michael T. Ashby、Susan Stanislav Alguindigue、Masood A. Khan
DOI:10.1016/s0020-1693(97)06099-4
日期:1998.4
donor orbital) reflect the steric demand of the R group. Thus, the size of the R group imposes a measured effect on the geometry of 2 and the tert-butyl group is not extraordinary. Although the enthalpic and entropic effects could not be deconvoluted for rotation about the Zr-S bond of 1 in the present study, literature precedents suggest that both enthalpic and entropic effects may play a role in determining