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

Structure and Bonding of Alkenes02:47

Structure and Bonding of Alkenes

15.9K
Olefins, which are unsaturated hydrocarbons containing one or more carbon–carbon double bonds, are broadly divided into alkenes and cycloalkenes. The general chemical formula of an alkene is CnH2n.
Doubly bonded carbons are sp2 hybridized and have a trigonal planar geometry. The double bond is composed of a σ bond formed by the overlap of hybrid orbitals and a π bond produced by the lateral overlap of unhybridized 2p orbitals on both the carbons. Each carbon atom is...
15.9K
Degree of Unsaturation02:05

Degree of Unsaturation

7.5K
The degree of unsaturation (U), or index of hydrogen deficiency (IHD), is defined as the difference in the number of pairs of hydrogen atoms between the compound and the acyclic alkane with the same number of carbon atoms. Each double bond or ring costs two hydrogen atoms compared to a saturated analog and results in one degree of unsaturation.
The degree of unsaturation for hydrocarbons is U = (2C + 2 − H) / 2, where C is the number of carbon atoms and H is the number of hydrogen atoms.
7.5K
Cycloalkanes02:28

Cycloalkanes

12.1K
Cycloalkanes are saturated cyclic hydrocarbons with carbon atoms arranged in the form of rings. They have two fewer hydrogen atoms than the corresponding acyclic alkane; therefore, their general formula is CnH2n. The structural formulas of cycloalkanes are simplified using the line-angle representation. The regular polygons are used to represent the cycloalkane rings, with each side representing a carbon-carbon bond.
The IUPAC nomenclature of cycloalkanes follows similar rules that apply to...
12.1K
Electrophilic Addition to Alkynes: Halogenation02:38

Electrophilic Addition to Alkynes: Halogenation

8.1K
Introduction
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.
8.1K
Nomenclature of Alkenes02:29

Nomenclature of Alkenes

11.7K
The IUPAC naming system for alkenes replaces -an- with -en- in the corresponding parent alkanes. Accordingly, a simple alkene replaces the -ane suffix of the alkane with -ene.
As per the IUPAC rules, the longest carbon chain containing the maximum number of double bonds is identified as the parent chain and is numbered such that the doubly bonded carbon atoms receive the lowest possible numbers. The location of the double bond is indicated by the number of its first carbon atom. In branched...
11.7K
Isomerism in Alkenes02:01

Isomerism in Alkenes

11.5K
Alkenes like 1-butene and 2-butene exhibit constitutional isomerism, as they differ in the position of the double bond. Further, 2-butene exhibits stereoisomerism and exists as two distinct compounds differing in spatial arrangement.
An isomer is called cis-2-butene when the methyl groups are on the same side of the double bond, and the other stereoisomer, in which methyl groups are on the opposite side of the double bond, is called trans-2-butene. The cis and trans stereoisomers are not...
11.5K

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

Cytotoxic indole diterpenoids from the fungus Aspergillus pseudonomius: isolation, structural elucidation, and biological evaluation.

Bioorganic chemistry·2026
Same author

Direct Deaminative Alkynylation of Aliphatic Primary Amines.

Angewandte Chemie (International ed. in English)·2026
Same author

Cardiomyocyte-derived USP20 mitigates myocardial ischemia/reperfusion injury through deubiquitinating GRP78.

Theranostics·2026
Same author

Saturated alginate oligosaccharide as a new functional food: preparation, characterization and alleviation of cognitive impairment through pre-intervention.

Food & function·2026
Same author

A Safe Approach to meta-Fluorinated Pyridines.

Angewandte Chemie (International ed. in English)·2026
Same author

Discovery, synthesis, and anti-cancer activity of N-CF<sub>3</sub>-benzimidazoles.

Molecular diversity·2026

相关实验视频

Updated: Jun 2, 2025

Efficient Synthesis of Polyfunctionalized Benzenes in Water via Persulfate-promoted Benzannulation of &#945;,&#946;-Unsaturated Compounds and Alkynes
05:34

Efficient Synthesis of Polyfunctionalized Benzenes in Water via Persulfate-promoted Benzannulation of α,β-Unsaturated Compounds and Alkynes

Published on: December 16, 2019

7.8K

和F2-来自基的环.

Yin Li1, Xiao-Bin Liu1, Vadym Sham2,3

  • 1Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, 510006, China.

Angewandte Chemie (International ed. in English)
|January 14, 2025
PubMed
概括
此摘要是机器生成的。

一种新的方法使用特定的试剂将简单的外环基转化为和的F2环. 这种高效的过程可以从毫克到多毫克的量进行扩展.

关键词:
这是一种基基.药物修饰 药物修饰是一种药物修饰.在这种情况下,的化物.自然产品是一种自然产品.环扩张的扩张方式

更多相关视频

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
08:12

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

Published on: December 16, 2022

3.2K
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

Published on: June 21, 2017

7.3K

相关实验视频

Last Updated: Jun 2, 2025

Efficient Synthesis of Polyfunctionalized Benzenes in Water via Persulfate-promoted Benzannulation of &#945;,&#946;-Unsaturated Compounds and Alkynes
05:34

Efficient Synthesis of Polyfunctionalized Benzenes in Water via Persulfate-promoted Benzannulation of α,β-Unsaturated Compounds and Alkynes

Published on: December 16, 2019

7.8K
Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
08:12

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

Published on: December 16, 2022

3.2K
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

Published on: June 21, 2017

7.3K

科学领域:

  • 有机化学 有机化学
  • 化学 的化学

背景情况:

  • 外环基是有机分子中常见的结构图案.
  • 将原子引入有机分子可以显著改变它们的特性.
  • 在合成化学中,开发有效的选择性化方法至关重要.

研究的目的:

  • 开发一种通用和高效的合成和F2环的方法.
  • 探索一种新的基试剂对化反应的有用性.

主要方法:

  • 该研究开发了一种新的合成途径,涉及试剂C6F5I (OAc) 2.
  • 该方法侧重于简单的外环基的转化.
  • 对反应条件进行了优化,以提高效率和可扩展性.

主要成果:

  • 成功开发了一种将外环基转化为和F2环的通用方法.
  • 该反应在各种尺度上表现出高效率,包括毫克,克和多克数量.
  • 试剂C6F5I(OAc) 2对于这种转化证明是有效的.

结论:

  • 开发的方法为合成和F2环提供了有价值的工具.
  • 试剂C6F5I(OAc) 2为选择性二化提供了一个实用的方法.
  • 反应的可扩展性使其适用于实验室研究和潜在的工业应用.