单甲基介导的原子转移
在PubMed上查看摘要
概括
此摘要是机器生成的。这项研究引入了一种新的原子转移 (XAT) 方法,使用高价 (III) 试剂从无光催化剂的基化物生成碳基,从而实现的有效功能化.
科学领域
- 有机化学
- 激进化学
- 合成方法
背景情况
- 原子转移 (XAT) 对于从基化物生成碳基至关重要.
- 使用斯坦南和西兰的现有方法有毒性和反应性问题.
- 对α-氨基基的光催化生成需要额外的试剂.
研究的目的
- 开发一种新的,无光催化剂的XAT方法来产生碳基.
- 使用高价值 (III) 试剂直接激发激素的形成.
- 为了使激活和非激活的基化物有效地发挥作用.
主要方法
- 直接激发含有高价值 (III) 试剂的单酸连接剂.
- 核性单甲基的产生
- 原子转移基添加 (ATRA) 到活性和非活性.
主要成果
- 通过直接试剂激发成功生成单甲基.
- 从活性化物中有效形成碳基.
- 演示了生成的基因与未激活的基的ATRA,提供了机械的洞察力.
结论
- 已经建立了一种新的,无光催化剂的XAT方法来产生碳基.
- 通过这种方法生成的单甲基具有独特的反应性.
- 这种方法突显了合成化学中简单的单碳基的潜力.
相关概念视频
In the presence of heat or light, alkanes react with molecular halogens to form alkyl halides by a substitution reaction called radical halogenation. This reaction has three steps: initiation, propagation, and termination, as seen in the radical chlorination of methane to produce methyl chloride.
In the initiation step of the reaction, the chlorine molecule undergoes homolytic cleavage in the presence of light or heat, forming two highly reactive chlorine radicals. Propagation occurs in two...
Typically, when alkenes react with halogens at low temperatures, an addition reaction occurs. However, upon increasing the temperature or under reaction conditions that form radicals, providing a low but steady concentration of halogen radicals, allylic substitution reaction is favored. This is because allylic hydrogens are very reactive as the formed intermediate is resonance stabilized. For example, when propene is treated with chlorine in the gas phase at 400 °C, it undergoes allylic...
The thermodynamic favorability of a reaction is determined by the change in Gibbs free energy (ΔG). ΔG has two components- enthalpy (ΔH) and entropy (ΔS). The entropy component is negligible for alkane halogenation because the number of reactants and product molecules are equal. In this case, the ΔG is governed only by the enthalpy component. The most crucial factor that determines ΔH is the strength of the bonds. ΔH can be determined by comparing the energy...
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...
Halogenation is the addition of chlorine or bromine across the double bond in an alkene to yield a vicinal dihalide. The reaction occurs in the presence of inert and non-nucleophilic solvents, such as methylene chloride, chloroform, or carbon tetrachloride.
Consider the bromination of cyclopentene. Molecular bromine is polarized in the proximity of the π electrons of cyclopentene. An electrophilic bromine atom adds across the double bond, forming a cyclic bromonium ion intermediate.
A...
α-Halogenation of aldehydes and ketones is a reaction involving the substitution of α hydrogens with halogens in the presence of a base. The reaction begins with the abstraction of α hydrogen by the base to produce a nucleophilic enolate ion. This intermediate undergoes a subsequent nucleophilic substitution with the halogen to produce a monohalogenated carbonyl compound. If the starting substrate has more than one α hydrogen, it is difficult to stop the reaction...

