Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

3.5K
Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous...
3.5K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

3.6K
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...
3.6K
Prochirality02:05

Prochirality

4.8K
The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
4.8K
Conformations of Cyclohexane02:11

Conformations of Cyclohexane

15.1K
Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
15.1K
Disubstituted Cyclohexanes: cis-trans Isomerism02:37

Disubstituted Cyclohexanes: cis-trans Isomerism

13.9K
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....
13.9K
Conformations of Cycloalkanes02:29

Conformations of Cycloalkanes

14.0K
Adolf von Baeyer attempted to explain the instabilities of small and large cycloalkane rings using the concept of angle strain — the strain caused by the deviation of bond angles from the ideal 109.5° tetrahedral value for sp3  hybridized carbons. However, while cyclopropane and cyclobutane are strained, as expected from their highly compressed bond angles, cyclopentane is more strained than predicted, and cyclohexane is virtually strain-free. Hence, Baeyer’s theory that...
14.0K

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Stabilizing a metalloid {Zn<sub>12</sub>} unit within a polymetallide environment in [K<sub>2</sub>Zn<sub>20</sub>Bi<sub>16</sub>]<sup>6</sup>.

Nature communications·2020
Same author

Synthesis and Crystal Structure of Dimorphic Dibenzo[cde,opq]rubicene.

Chemistry (Weinheim an der Bergstrasse, Germany)·2019
Same author

Polybismuthide Anions as Ligands: The Homoleptic Complex [(Bi<sub>7</sub> )Cd(Bi<sub>7</sub> )]<sup>4-</sup> and the Ternary Cluster [(Bi<sub>6</sub> )Zn<sub>3</sub> (TlBi<sub>5</sub> )]<sup>4</sup>.

Angewandte Chemie (International ed. in English)·2019
Same author

The Identity of "Ternary" A/Tl/Pb or K/Tl/Bi Solid Mixtures and Binary Zintl Anions Isolated From Their Solutions.

Chemistry (Weinheim an der Bergstrasse, Germany)·2018
Same author

Between MOFs and molecules: organolead(IV) compounds with chain structures.

Acta crystallographica. Section C, Structural chemistry·2018
Same author

[Te<sub>6</sub> N<sub>8</sub> (TeCl<sub>4</sub> )<sub>4</sub> ]-Tellurium Nitride Stabilized by Tellurium Tetrachloride.

Angewandte Chemie (International ed. in English)·2018

相关实验视频

Updated: Jan 8, 2026

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

7.3K

横向扭曲的1,2-Dibora-4-gallatacyclopentane 阳离子 阳离子

A Wahid Mesbah1, Meisam Soleimani1, Fatemeh Akbari Lasboo1

  • 1Chemistry & Chemical Engineering Research Center of Iran, 14968-13151 Tehran, Iran.

Inorganic chemistry
|December 18, 2025
PubMed
概括

研究人员合成了一种新型的1,2-二博拉-4-加拉塔cyclopentane离子. 这种独特的-化合物由于电子相互作用而表现出扭曲的非平面环结构.

更多相关视频

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
09:45

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

Published on: March 20, 2017

10.8K
Synthesis of a Borylated Ibuprofen Derivative Through Suzuki Cross-Coupling and Alkene Boracarboxylation Reactions
08:56

Synthesis of a Borylated Ibuprofen Derivative Through Suzuki Cross-Coupling and Alkene Boracarboxylation Reactions

Published on: November 30, 2022

3.4K

相关实验视频

Last Updated: Jan 8, 2026

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

7.3K
Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
09:45

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

Published on: March 20, 2017

10.8K
Synthesis of a Borylated Ibuprofen Derivative Through Suzuki Cross-Coupling and Alkene Boracarboxylation Reactions
08:56

Synthesis of a Borylated Ibuprofen Derivative Through Suzuki Cross-Coupling and Alkene Boracarboxylation Reactions

Published on: November 30, 2022

3.4K

科学领域:

  • 有机金属化学 有机金属化学
  • 无机化学 无机化学
  • 材料科学 材料科学 材料科学

背景情况:

  • 环坦衍生物在有机化学中具有根本性的作用.
  • 和化合物具有独特的电子和结构性质.
  • 了解包含主要组元素的异循环对于新材料开发至关重要.

研究的目的:

  • 为了合成和描述一个包含和的新型五环.
  • 为了研究1,2-二博拉-4-加拉塔cyclopentane离子的结构和电子特性.
  • 为了探索异质原子对环形几何学的影响,与基于碳的类似物相比.

主要方法:

  • 通过对2,3-diboratabutadiene的二盐与Ga2I3.3的反应进行合成.
  • 使用多核NMR光谱 (11B,1H,1C) 进行了表征.
  • 通过单晶X射线衍射进行结构分析.

主要成果:

  • 成功合成了1,2-dibora-4-gallatacyclopentane离子. 这是一个非常好的方法.
  • 测定一个扭曲的,非平面的五个成员的环结构.
  • 观察到的Ga-C-B角 (~95.1°) 显著小于环丹 (104.4°).
  • 扭转角C-B-B-C (60.3°) 明显大于环 (14.4°) 的扭转角.
  • 由 σ ((Ga-C) 键和 p-轨道相互作用造成的结构扭曲.

结论:

  • 合成的1,2-dibora-4-gallatacyclopentane离子代表了一种新的异环化合物.
  • -碳键和原子之间的电子相互作用决定了非平面环形的几何形状.
  • 这项研究扩大了对主要组元素含有异环体及其独特结构特征的理解.