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Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

2.6K
Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in 1,5-hexadiene, referred...
2.6K
Valence Bond Theory and Hybridized Orbitals02:38

Valence Bond Theory and Hybridized Orbitals

31.8K
According to valence bond theory, a covalent bond results when: (1) an orbital on one atom overlaps an orbital on a second atom, and (2) the single electrons in each orbital combine to form an electron pair. The strength of a covalent bond depends on the extent of overlap of the orbitals involved. Maximum overlap is possible when the orbitals overlap on a direct line between the two nuclei.
A σ bond (single bond in a Lewis structure) is a covalent bond in which the electron density is...
31.8K
Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

68.6K
The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
68.6K
Molecular Orbital Theory II03:51

Molecular Orbital Theory II

28.0K
Molecular Orbital Energy Diagrams
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Valence Bond Theory02:45

Valence Bond Theory

50.8K
Overview of Valence Bond Theory
50.8K
Valence Bond Theory02:42

Valence Bond Theory

11.4K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.4K

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関連する実験動画

Updated: Mar 3, 2026

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
09:37

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry

Published on: October 18, 2019

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分子間表面 σ-結合メタテシス

Hong-Ying Gao1,2, Philipp Alexander Held, Saeed Amirjalayer1,2

  • 1Center for Nanotechnology , Heisenbergstraße 11, 48149 Münster, Germany.

Journal of the American Chemical Society
|May 4, 2017
PubMed
まとめ

この研究は,表面合成のためのシリレーションとデシリレーションを用いた新しい表面化学アプローチを導入しています. この方法により,不安定な分子から複雑な自己組み立て構造と共性ポリマーを作成できます.

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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Characterizing Lewis Pairs Using Titration Coupled with In Situ Infrared Spectroscopy
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Characterizing Lewis Pairs Using Titration Coupled with In Situ Infrared Spectroscopy

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Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
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科学分野:

  • 表面化学
  • 有機化学
  • 材料科学

背景:

  • 溶液相有機化学における機能群の保護には,シリレーションとデシリレーションが不可欠である.
  • 表面化学は分子組立と合成のためのユニークな経路を提供します.
  • 特定の分子は従来の溶液や固体操作には不安定である.

研究 の 目的:

  • 金属表面における芳香カルボキシル酸によるシライ化アルキンの σ-結合メタテシスを探求する.
  • 表面合成のための新しい保護グループ戦略を実証する.
  • 不安定な前体から自己組み立て構造と共性ポリマーを製造する.

主な方法:

  • Ag{11}とAu{11}の表面での σ-結合転移反応
  • 機械学的洞察のための密度関数理論 (DFT) の計算.
  • 表面分析のためのX線光電子光譜 (XPS)
  • 表面合成技術について

主要な成果:

  • シリア化アルキンとカルボキシル酸の間の表面媒介の σ 結合転移の最初の例.
  • 終端アルキンとシリルエステルの形成は,Ag{11}とAu{11}
  • ヘクサエチニルベンゼンの自己組み立てが成功しました.
  • カスケードプロセスは,σ-結合メタテシスとAu ((111) 上のグラザー結合を組み合わせて,共性ポリマーを形成する.

結論:

  • 表面媒介のシリレーション/デシリレーションは,表面合成のための堅固な戦略を提供します.
  • このアプローチにより,不安定な分子から複雑な構造を構築することができます.
  • Au ((111) の結合反応経路は,共性ポリマー製造のための新しい道を開きます.