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Radicals: Electronic Structure and Geometry01:07

Radicals: Electronic Structure and Geometry

This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...
Radical Reactivity: Steric Effects01:10

Radical Reactivity: Steric Effects

The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
Along with electronic factors, steric factors also account...
Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

sp3d and sp3d 2 Hybridization
Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

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...
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group with both...
Radical Reactivity: Overview01:11

Radical Reactivity: Overview

Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired molecule. These three...

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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
10:44

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Published on: April 19, 2019

スピロビス ((pentagerma) [1.1.1]プロペラン):安定したテトララジカロイドである.

Yuki Ito1, Vladimir Ya Lee, Heinz Gornitzka

  • 1Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan.

Journal of the American Chemical Society
|April 19, 2013
PubMed
まとめ

研究者らは,新型のスピロビス (pentagerma (pentagerma) [1.1.1]プロペラン (propellane) ]分子構造を開発した. 計算による研究では,この安定したテトララジカロイド種におけるゲルマニウム橋頭間の弱い結合相互作用が明らかになった.

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Solid-phase Synthesis of [4.4] Spirocyclic Oximes
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Solid-phase Synthesis of [4.4] Spirocyclic Oximes

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Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of &#945;-Imino &#947;-Lactones and Alkylidene Pyrazolones
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Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones

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10:44

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Published on: April 19, 2019

Solid-phase Synthesis of [4.4] Spirocyclic Oximes
05:15

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Published on: February 6, 2019

Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of &#945;-Imino &#947;-Lactones and Alkylidene Pyrazolones
10:17

Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones

Published on: February 7, 2019

科学分野:

  • クラスター化学クラスター化学
  • 有機金属化学 有機金属化学
  • マテリアルサイエンス 材料科学

背景:

  • 新しい分子構造は,クラスター化学の進歩に不可欠です.
  • ポリゲルマニウムシステムの結合を理解することは,継続的な課題です.
  • テトララジカロイド種は,ユニークな電子特性を提供しています.

研究 の 目的:

  • 新型スピロビス ((pentagerma) [1.1.1]プロペラン) の微生物を合成し,特徴づけること.
  • このユニークな分子構造の電子構造と結合性質を調査するために.
  • ゲルマニウムベースのクラスター化合物の可能性を調査する.

主な方法:

  • スピロビス ((pentagerma) [1.1.1]プロペラン) デリバティブの合成.
  • 電子特性を探求するための計算研究 (DFTなど)
  • ゲルマニウムブリッジヘッド間の結合相互作用の分析.

主要な成果:

  • 安定したテトララジカロイドスピロビス ((pentagerma[1.1.1]プロペラン) の合成が成功しました.
  • 計算分析により,ゲルマニウムブリッジヘッドの間の弱い結合相互作用が明らかになった.
  • この研究は,このシステムの形式的にペア化されていない電子の性質についての洞察を提供します.

結論:

  • Spirobis ((pentagerma[1.1.1]propellane) は,クラスター化学における新しい分子構造のクラスを表しています.
  • 弱い結合相互作用が,このテトララジカロイドの電子的振る舞いを支配する.
  • この研究は,新しいゲルマニウムベースの機能的材料の設計への道を開きます.