光化学C-C 键激活在酸中:一个新途径到反应终端花复合物L-CP
Tim Görlich1, Daniel S Frost1, Nico Boback1
1Freie Universität Berlin, Institut für Chemie und Biochemie, Fabeckstr. 34/36, 14195 Berlin, Germany.
Journal of the American Chemical Society
|November 10, 2021
概括
复合物的光化学激活会分裂C-C键,形成新的-复合物. 这些复合物与亚化物反应,形成三酸化合物,提供清洁的合成途径.
科学领域:
- 有机金属化学
- 摄影化学
- 合成化学
背景情况:
- 酸是有机金属化学中的多功能构件.
- 复合物广泛用于催化和合成.
- 了解C-C键激活对于开发新合成方法至关重要.
研究的目的:
- 研究Pt(0) - 基因复合体中的C(sp) -C(sp2) 键的光化学激活.
- 开发一种新型合成途径,用于终端Pt-II-cyaphido复合物.
- 在循环添加反应中探索这些合物复合物的反应性.
主要方法:
- Pt(0) -η2-aryl-phosphaalkyne复合物的光化学激活.
- 由此产生的Pt(II) -cyaphido复合物的特征.
- 对有机亚酸的 [3+2] 循环添加反应的研究.
主要成果:
- 通过光化学激活了C(sp) -C(sp2) 键.
- 通过清洁,原子经济的途径合成了新的终端Pt(II) -cyaphido复合物.
- Pt(II) -cyaphido复合物与有机酸盐发生了 [3+2] 循环添加,形成Pt(II) -triazaphospholato复合物.
- 在加热时观察到反向的减少消除反应.
结论:
- 在Pt(0) - 基因复合体中的光化学C-C键裂变提供了Pt(II) - 基因复合体的高效合成.
- 这些cyapido复合物是构建异环的有价值的中间体.
- 开发的方法为复杂的有机金属结构提供了清洁和原子经济的方法.
相关概念视频
Electrophilic Addition to Alkynes: Halogenation
8.9K
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.
8.9K
Cycloaddition Reactions: MO Requirements for Photochemical Activation
2.2K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.2K
Aldehydes and Ketones to Alkenes: Wittig Reaction Mechanism
4.0K
The Wittig reaction, which converts aldehydes or ketones to alkenes using phosphorus ylides, proceeds through a nucleophilic addition‒elimination process.
The reaction begins with the nucleophilic addition between a phosphorus ylide and the carbonyl compound. Due to its carbanionic character, phosphorus ylide acts as a strong nucleophile and attacks the electrophilic carbonyl group. This generates a charge-separated dipolar intermediate called betaine. The negatively charged oxygen atom and...
The reaction begins with the nucleophilic addition between a phosphorus ylide and the carbonyl compound. Due to its carbanionic character, phosphorus ylide acts as a strong nucleophile and attacks the electrophilic carbonyl group. This generates a charge-separated dipolar intermediate called betaine. The negatively charged oxygen atom and...
4.0K
Photochemical Electrocyclic Reactions: Stereochemistry
1.9K
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
1.9K
Preparation of Alkynes: Alkylation Reaction
10.9K
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.
10.9K
Electrophilic Addition to Alkynes: Hydrohalogenation
10.4K
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.
10.4K

![[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F59739.jpg&w=3840&q=50)
