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関連する概念動画

Carbon Skeletons01:12

Carbon Skeletons

Life on Earth is carbon-based, as all macromolecules that make up living organisms contain carbon atoms. All organic compounds have a carbon backbone. Each carbon atom is tetravalent and can bond with four other atoms, making it an extraordinarily flexible component of biological molecules. Because carbon’s valence electrons are stable, it rarely becomes an ion. As the carbon chain increases in length, structural modifications such as ring structures, double bonds, and branching side chains...
VSEPR Theory and the Basic Shapes02:52

VSEPR Theory and the Basic Shapes

Overview of VSEPR Theory
Stereoisomerism of Cyclic Compounds02:33

Stereoisomerism of Cyclic Compounds

In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
Structure of Conjugated Dienes01:16

Structure of Conjugated Dienes

Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...
Diels–Alder Reaction: Characteristics of Dienes01:29

Diels–Alder Reaction: Characteristics of Dienes

The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is more stable, the...
Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.

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Updated: Jul 6, 2026

Facile Preparation of (2Z,4E)-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
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Facile Preparation of (2Z,4E)-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate

Published on: June 21, 2017

偶然性およびベンジジンの4つの多形構造,C12H12N2

Michal Rafilovich1, Joel Bernstein

  • 1Department of Chemistry, Ben-Gurion University of the Negev, P.O. Box 653, Be'er Sheva 84105, Israel.

Journal of the American Chemical Society
|September 14, 2006
PubMed
まとめ
この要約は機械生成です。

研究者らは,化学合成に使用される化合物であるベンジジンの4つの新しい結晶形 (ポリモルフ) を発見した. これらのポリモルフは異常な分子配列を示しており,以前は報告されていなかったため,ベンジジンに関する知識が拡大されました.

さらに関連する動画

Synthesis and Structure Determination of µ-Conotoxin PIIIA Isomers with Different Disulfide Connectivities
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Technical Approach for Structural Analysis of an Unknown Compound in Huoxiang Zhengqi Oral Liquid based on Linear Ion Trap Mass Spectrometry
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Technical Approach for Structural Analysis of an Unknown Compound in Huoxiang Zhengqi Oral Liquid based on Linear Ion Trap Mass Spectrometry

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関連する実験動画

Last Updated: Jul 6, 2026

Facile Preparation of (2Z,4E)-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
06:46

Facile Preparation of (2Z,4E)-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate

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Synthesis and Structure Determination of µ-Conotoxin PIIIA Isomers with Different Disulfide Connectivities
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Technical Approach for Structural Analysis of an Unknown Compound in Huoxiang Zhengqi Oral Liquid based on Linear Ion Trap Mass Spectrometry
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科学分野:

  • クリスタル・エンジニアリング (Crystal Engineering) とは
  • 材料科学 材料科学とは
  • 固体化学 固体化学

背景:

  • ベンジジディンは,二機能性分子で,水素結合ドナーとしての可能性があります.
  • 同結晶形成は,材料設計における重要な戦略である.
  • 2005年11月現在,ケンブリッジ構造データベースではベンジジンの結晶構造は報告されていない.

研究 の 目的:

  • ベンジジンの共結晶を探すために.
  • ベンジジンの固体状態の形態を特徴付けるために.
  • ベンジジン多形体の構造的多様性を調査する.

主な方法:

  • 単結晶X線微分法により,分子構造を決定する.
  • 高温 (HT) 条件下でのポリモルフスクリーニング.
  • スペクトル分析 (IR,ラマンなど).
  • 熱力学的特徴. 熱力学的特徴.

主要な成果:

  • ベンジジンの4つの新しいポリモルフが特定され,構造的に特徴づけられました.
  • これらのポリモルフは,非対称な単位 (Z' = 1.5,3,4.5) で異常な数の分子を示しています.
  • Z' = 4.5 の2つの形 (IとIV) は視覚的に区別できない.
  • 分子平面性は,結晶学部位 (逆転中心) に基づいて変化します.

結論:

  • この研究は,ベンジジンの有意な,これまで報告されていない構造的複雑性を明らかにした.
  • 特定されたポリモルフは,既存の構造データベースに挑戦しています.
  • これらのポリモルフを理解することは,ベンジジンの固体特性と反応性を制御するために不可欠です.