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相关概念视频

Acid-Catalyzed α-Halogenation of Aldehydes and Ketones01:21

Acid-Catalyzed α-Halogenation of Aldehydes and Ketones

4.8K
By replacing an α-hydrogen with a halogen, acid-catalyzed α-halogenation of aldehydes or ketones yields a monohalogenated product
In the first step of the mechanism, the acid protonates the carbonyl oxygen resulting in a resonance-stabilized cation, which subsequently loses an α-hydrogen to form an enol tautomer. The C=C bond in an enol is highly nucleophilic because of the electron-donating nature of the –OH group. Consequently, the double bond attacks an electrophilic halogen to form a...
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Acid Halides to Alcohols: LiAlH4 Reduction01:19

Acid Halides to Alcohols: LiAlH4 Reduction

3.8K
Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
3.8K
Hydroboration-Oxidation of Alkenes03:08

Hydroboration-Oxidation of Alkenes

11.1K
In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
11.1K
Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation02:47

Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation

20.7K
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.
20.7K
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

12.6K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
12.6K
Aldehydes and Ketones with Alcohols: Hemiacetal Formation01:19

Aldehydes and Ketones with Alcohols: Hemiacetal Formation

9.4K
Similar to water, alcohols can add to the carbonyl carbon of the aldehydes and ketones. The addition of one molecule of alcohol to the carbonyl compound forms the hemiacetal or half acetal. As depicted below, in a hemiacetal, the carbon is directly linked to an OH and OR group.
9.4K

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一种阿尔德海德稳定型的氧二.

Annabel Benny1, Devika Vijayan1, Rajeshkumar Thayalan2

  • 1School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Vithura, Thiruvananthapuram 695551, India. venugopal@iisertvm.ac.in.

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概括
此摘要是机器生成的。

研究人员合成了一种新型的二,由阿尔代联结物稳定. 这种化合物与西兰反应后释放化物,揭示了反应性中心,催化了基化.

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科学领域:

  • 有机金属化学 有机金属化学
  • 化学 的化学
  • 催化剂是一种催化剂.

背景情况:

  • 化合物表现出不同的易斯酸度和反应性.
  • perfluoroalkyl 组显著改变金属复合物的电子和硬质性质.
  • 合物联体可以与金属中心协调,从而影响反应性.

研究的目的:

  • 为了合成和表征一种新型的 perfluoro-tert-butoxyaluminum dication,其稳定性由化物联体.
  • 为了研究合成的Dication的易斯酸反应性.
  • 探索中心在催化转换中的潜力.

主要方法:

  • 使用特定的前体合成 perfluoro-tert-butoxyaluminum 分离物.
  • 使用光谱和晶体学技术进行结构性表征.
  • 反应性研究涉及用三基治疗和随后的催化试验.

主要成果:

  • 成功合成并阐明了[{(F3C) 3CO}Al{4-MePhCHO}5]2+的结构.
  • 在与Et3SiH反应时,表现出化联体的去氧化消除.
  • 通过新推出的反应性中心即时促进烯水化.

结论:

  • perfluoro-tert-butoxyaluminum dication 代表了一个独特的易斯酸性物种.
  • 协调的化物作为保护组,使得能够隔离一个反应性中间体.
  • 该系统为产生用于水化活性催化剂提供了一条新的途径.