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相关概念视频

Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

3.4K
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...
3.4K
Carbocations02:10

Carbocations

12.7K
Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...
12.7K
Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

42.2K
sp3d and sp3d 2 Hybridization
42.2K
Organic Compounds03:02

Organic Compounds

55.3K
All living things are formed mostly of carbon compounds called organic compounds. The category of organic compounds includes both natural and synthetic compounds that contain carbon. Although a single, precise definition has yet to be identified by the chemistry community, most agree that a defining trait of organic molecules is the presence of carbon as the principal element, bonded to hydrogen and other carbon atoms. However, some carbon-containing compounds such as carbonates, cyanides, and...
55.3K
Structure and Physical Properties of Alkynes02:37

Structure and Physical Properties of Alkynes

12.4K
Introduction:
In nature, compounds containing both carbon and hydrogen are known as "hydrocarbons". Aliphatic hydrocarbons are compounds whose molecules contain saturated single bonds (i.e., alkanes) or unsaturated double or triple bonds. Alkenes contain carbon–carbon double bonds and have a structural formula CnH2n. Unsaturated hydrocarbons containing carbon–carbon triple bonds are called "alkynes" and are structurally represented by the formula CnH2n-2.
The...
12.4K
Structure and Nomenclature of Ethers02:28

Structure and Nomenclature of Ethers

13.7K
Structure and Bonding
Ethers are organic compounds with an ether functional group which is characterized by an oxygen atom connected to two — identical or different — alkyl, aryl, or vinyl groups. The C–O–C linkage in dimethyl ether — the simplest ether — has an approximately tetrahedral bond angle of 110.3 degrees. The oxygen atom is sp3- hybridized, with the C–O distance being about 140 pm.
Classification of Ethers
Based on their attached substituent...
13.7K

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相关实验视频

Updated: Nov 15, 2025

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

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

Published on: April 19, 2019

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乙烯基碳酸 (H-CC-C̈-OH)

Bastian Bernhardt1, Marcel Ruth1, André K Eckhardt1

  • 1Institute of Organic Chemistry, Justus Liebig University Giessen, Heinrich-Buff-Ring 17, 35392 Giessen, Germany.

Journal of the American Chemical Society
|March 5, 2021
PubMed
概括

合成和研究了一种对外星化学至关重要的分子 - - 乙基. 这种同位素通过道化过程重新排列为propynal,为星际化学反应提供了洞察力.

科学领域:

  • 天体化学
  • 物理化学
  • 有机化学

背景情况:

  • 在外星化学中, C3H2O 的潜在能量表面具有重要意义.
  • 之前的研究没有对乙基基同位素进行表征.

研究的目的:

  • 合成和表征乙基基 (1).
  • 研究乙烯的光化学和热反应.
  • 了解道在化学反应中的作用.

主要方法:

  • 乙烯基酸乙烯基的高真空闪光热解.
  • 在低温 (3K和20K) 中将产品锁定在固体基质中.
  • 在436nm的光化学辐射和黑暗反应.
  • 计算化学 (CCSD(T) /cc-pVTZ和B3LYP/def2-QZVPP).

主要成果:

  • 基基基基基基基基基基基基基基基基基基基基基基
  • 辐射诱导转换器到 cis 转换器的重新排列.
  • 黑色反应显示了符合特定的[1,2]H道化过程,导致了大约70小时半衰期的propynal形成.
  • 计算结果与实验观察结果一致.

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Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
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Preparation of 6-aminocyclohepta-2,4-dien-1-one Derivatives via Tricarbonyltroponeiron
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Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
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Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units

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结论:

  • 这项研究成功地描述了在天体化学环境中重要的异构体乙烯.
  • 符合规范的道化是乙基基转化为的关键机制.
  • 这些发现有助于了解星际环境中的反应途径.