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Updated: Jul 18, 2026

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
09:22

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

カチオン群4のジーグラー・ナッタ挿入産物の構造イソメリゼーションの直接観察

Richard J Keaton1, Lawrence R Sita

  • 1Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA.

Journal of the American Chemical Society
|August 1, 2002
PubMed
まとめ

研究者は,Ziegler-Nattaポリメリゼーション中の構造的異体化を観察するための実験モデルを開発しました. このモデルは,プロペンポリメリゼーションに関連するチェーンエピメリゼーション機構への直接的な洞察を提供します.

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SN2 Reaction: Stereochemistry02:23

SN2 Reaction: Stereochemistry

In an SN2 reaction, the nucleophilic attack on the substrate and departure of the leaving group occurs simultaneously through a transition state. As the nucleophile approaches the substrate from the back-side, the configuration of the substrate carbon changes from tetrahedral to trigonal bipyramidal and then back to tetrahedral, leading to an inversion in the configuration of the product.
If the substrate is an achiral molecule at the α-carbon, the inversion of configuration is not observed.
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E1 Reaction: Stereochemistry and Regiochemistry

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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta catalyst, high molecular...
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