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相关概念视频

Regioselectivity and Stereochemistry of Hydroboration02:36

Regioselectivity and Stereochemistry of Hydroboration

9.3K
A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn stereochemistry.
9.3K
Nucleophilic Aromatic Substitution: Elimination–Addition01:11

Nucleophilic Aromatic Substitution: Elimination–Addition

5.0K
Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...
5.0K
Electrophilic Aromatic Substitution: Nitration of Benzene01:20

Electrophilic Aromatic Substitution: Nitration of Benzene

8.2K
The nitration of benzene is an example of an electrophilic aromatic substitution reaction. It involves the formation of a very powerful electrophile, the nitronium ion, which is linear in shape. The reaction occurs through the interaction of two strong acids, sulfuric and nitric acid.
8.2K
Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism01:18

Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism

2.6K
Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...
2.6K
Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

2.6K
Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo,...
2.6K
Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

3.3K
Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
3.3K

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Synthesis of 1,2-Azaborines and the Preparation of Their Protein Complexes with T4 Lysozyme Mutants
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通过BN-二烯对1,2-二烯的定位异构

Tomoya Ozaki1, Skylar Diamandis1, Nina Rybansky1

  • 1Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States.

Journal of the American Chemical Society
|January 13, 2026
PubMed
概括
此摘要是机器生成的。

研究人员开发了一种新的光化学方法,使用BN-烯中间体将C5-aryl-1,2-azaborines转化为C4-aryl异构体. 这一突破使得各种各样的1,2-azaborine化合物的合成成为可能.

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Preparation of Contiguous Bisaziridines for Regioselective Ring-Opening Reactions
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科学领域:

  • 有机化学
  • 摄影化学
  • 异环化学

背景情况:

  • 1,2-阿扎波林是多功能异环化合物,在各种化学领域都有应用.
  • 合成1,2-azaborines的特定异构体,特别是C4-aryl衍生物,可能是具有挑战性的.
  • 现有的方法往往缺乏复杂替代的普遍性或区域选择性.

研究的目的:

  • 开发一种新型的光化学策略,使C5-aryl-1,2-azaborines变为C4-aryl-1,2-azaborines.
  • 阐明反应机制,包括BN-烯中间体和氧化途径的作用.
  • 为了证明这种方法在合成二功能化和六替代的1,2-azaborines方面具有广泛的适用性.

主要方法:

  • 对C5-aryl-1,2-azaborines进行光化学异构.
  • 产生和表征BN-烯中间体.
  • 检测反应途径的标记研究.
  • 暂时吸收 (TA) 光谱用于研究反应动态.
  • 密度函数理论 (DFT) 计算以支持机械学理解.

主要成果:

  • 实现了C5-aryl-1,2-azaborines到C4-aryl对应物的新型光化学定位异构.
  • 反应通过BN-烯中间体和氧化基离子路径进行.
  • 标签,TA光谱和DFT计算证实了拟议的机制.
  • 该方法提供了第一条通往C4,C5-非功能化1,2-azaborines的通道.
  • 完成了对1,2-阿扎博林衍生物的区域选择性合成.

结论:

  • 开发的光化学方法为C4-aryl-1,2-azaborines提供了一种高效和多功能途径.
  • 这种方法克服了先前替代阿扎波林的合成策略的局限性.
  • 这些发现为合成具有潜在应用的复杂异环结构开辟了新的途径.