(III) - - 基因的催化甲基化反应
Alyssa Daniels1, Christoph Wölper1, Gebhard Haberhauer1
1Fakultät für Chemie, Universität Duisburg-Essen, Universitätsstr. 7, D, 45117, Essen, Germany.
Chemistry (Weinheim an der Bergstrasse, Germany)
|May 14, 2024
概括
(III) 化物催化基化反应,为过渡金属提供可持续的替代品. 这一进步使得Cis添加产品和使用含有内部基因的乙烯可用于更绿色的化学合成.
科学领域:
- 绿色化学和可持续合成.
- 催化和反应机制.
- 有机合成和C-C键的形成.
背景情况:
- 绿色化学强调了可持续的分子级反应.
- 基化是一种原子经济的C-C合反应.
- 以前,基化需要过渡金属催化剂.
研究的目的:
- 使用 (III) 化物开发一种可持续的基化反应.
- 探索酸乙烯在内部基因的醇基尼化中的应用.
- 为了研究 (III) 催化基化反应的反应机制.
主要方法:
- (III) 化物催化用于基化.
- 乙烯与内部基因的应用.
- 13C标记实验和量子化学计算.
- 对立体化学反应产物的分析 (cis加法).
主要成果:
- 印 (III) 化物只能产生高达86%的Cis添加产品.
- 乙烯的首次应用用于内部基因的醇基尼化.
- 证明了使用基替代乙烯的可行性,与黄金催化不同.
- 根据实验和计算数据假定了两种可能的反应机制.
结论:
- (III) 化物为基化提供了可持续和有效的催化系统.
- 这种方法扩大了基化的范围,特别是与内部和各种试剂.
- 机械学见解有助于开发绿色化学中先进的催化系统.
相关概念视频
02:38Electrophilic Addition to Alkynes: Halogenation
8.2K
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.
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.
8.2K
02:34Preparation of Alkynes: Dehydrohalogenation
15.8K
Introduction
Alkynes can be prepared by dehydrohalogenation of vicinal or geminal dihalides in the presence of a strong base like sodium amide in liquid ammonia. The reaction proceeds with the loss of two equivalents of hydrogen halide (HX) via two successive E2 elimination reactions.
Alkynes can be prepared by dehydrohalogenation of vicinal or geminal dihalides in the presence of a strong base like sodium amide in liquid ammonia. The reaction proceeds with the loss of two equivalents of hydrogen halide (HX) via two successive E2 elimination reactions.
15.8K
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
7.7K
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
7.7K
02:35Electrophilic Addition to Alkynes: Hydrohalogenation
9.9K
Electrophilic addition of hydrogen halides, HX (X = Cl, Br or I) to alkenes forms alkyl halides as per Markovnikov's rule, where the hydrogen gets added to the less substituted carbon of the double bond. Hydrohalogenation of alkynes takes place in a similar manner, with the first addition of HX forming a vinyl halide and the second giving a geminal dihalide.
9.9K
02:27Preparation of Alkynes: Alkylation Reaction
10.1K
Introduction
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
10.1K
02:47Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation
18.0K
Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
18.0K