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Updated: Feb 22, 2026

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
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Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

Published on: March 20, 2017

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PdII-フェニルとCuI-アルキル複合体間の逆転と保持トランスメタレーションの制御方法:理論的洞察

Hong Zheng1, Kazuhiko Semba2, Yoshiaki Nakao2

  • 1Fukui Institute for Fundamental Chemistry, Kyoto University , Takano-Nishi-hiraki-cho 34-4, Sakyo-ku, Kyoto 606-8103, Japan.

Journal of the American Chemical Society
|September 20, 2017
PubMed
まとめ

Pd/Cu触媒におけるトランスメタレーションステレオ化学は,CaHMeR群の電子特性によって制御される. 結合は逆転を安定させ,アルキルとビニル群は保持メカニズムを好む.

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Depending upon the different spatial orientation of the substituents, the disubstituted cycloalkanes exhibit two types of stereoisomers. The cis isomers have the substituents on the same side of the ring, whereas the trans isomers have the substituents on the opposite sides. These stereoisomers exhibit different physical properties and cannot be interconverted without breaking the carbon-carbon bonds.
In cyclohexane, the substituents can occupy different positions generating distinct isomers....
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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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