三重烯介导的光催化化三级C-H键的三重烯介导光催化化
Noriaki Shimamoto1, Norihito Arichi1, Hiroaki Ohno1
1Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan.
概括
这项研究引入了一种新的光催化方法,用于C-H亚化,使用三重烯来抽象原子. 该过程显示出对三级C-H键的高选择性,即使在像二酸这样的复杂分子中也是如此.
科学领域:
- 有机化学 有机化学
- 光催化作用的光催化
- 合成方法论 合成方法论
背景情况:
- C-H功能化是有机合成的一个关键领域.
- C-H 键的酸化对于产生含的化合物很重要.
- 开发选择性和高效的化方法仍然是一个挑战.
研究的目的:
- 开发一种新的光催化方法,用于C(sp3) -H亚化.
- 为了利用三重烯中间体进行原子抽象.
- 为了实现第三级C-H债券的高选择性.
主要方法:
- 采用光催化剂产生三重烯中间体.
- 硫酸通过能量转移作为烯前体和酸来源.
- 反应条件在效率和选择性方面得到了优化.
主要成果:
- 成功开发了一种新的光催化C(sp3) -H亚化反应.
- 该方法对三级C-H债券表现出极好的选择性.
- 亚化适用于含有白的二,展示了其在复杂分子合成中的实用性.
结论:
- 描述的光催化性亚化为选择性C-H功能化提供了一条新的途径.
- 使用三重烯作为原子抽取器是有效的.
- 这种方法为有机合成提供了有价值的工具,特别是复杂.
相关概念视频
Electrophilic Aromatic Substitution: Nitration of Benzene
8.1K
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.
8.1K
Catalysis
30.0K
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
30.0K
Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride
2.2K
Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation reactions,...
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation reactions,...
2.2K
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
Photochemical Electrocyclic Reactions: Stereochemistry
2.2K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
2.2K
Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation
5.6K
Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
5.6K
![Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F60786.jpg&w=3840&q=50)

