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相关概念视频

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

9.6K
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.
9.6K
Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation02:47

Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation

17.6K
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.
17.6K
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

7.6K
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.
7.6K
Regioselectivity and Stereochemistry of Hydroboration02:36

Regioselectivity and Stereochemistry of Hydroboration

8.0K
A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...
8.0K
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

8.3K
The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
8.3K
Hydroboration-Oxidation of Alkenes03:08

Hydroboration-Oxidation of Alkenes

7.6K
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.
7.6K

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Synthesis of Hypervalent Iodonium Alkynyl Triflates for the Application of Generating Cyanocarbenes
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用铁催化的顺序化.

Xue Wang1, Jiajin Zhao1, Dongyang Wang2

  • 1Center of Chemistry for Frontier Technologies, Department of Chemistry, Zhejiang University, Hangzhou, China.

Nature communications
|May 9, 2025
PubMed
概括
此摘要是机器生成的。

铁催化使得使用基因的基环的高度选择性顺序化. 这种方法有效地产生性-立体化合物,对区域,立体和选择性有很好的控制.

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科学领域:

  • 有机金属化学 有机金属化学
  • 不对称的催化剂.
  • 化学 化学

背景情况:

  • 水化是有机化学中的一个关键反应.
  • 为复杂的含分子开发选择性催化方法仍然是一个挑战.
  • 硫循环为探索新的化学转换提供了独特的结构图案.

研究的目的:

  • 开发一种高区域, diastereo, 和 enantioselective 铁催化序列水化 o-alk-n-enyl-phenyl silanes 的与基因.
  • 为了合成性,完全用碳替代的类固醇基环.
  • 研究连接体对选择性的电子影响,并提出反应机制.

主要方法:

  • 使用各种基因的铁催化序列化.
  • 合成有5,6和7个成员的基环.
  • 对于类固醇化合物的三重水化反应.
  • 变量时间规范化分析 (VTNA) 和H/D交换实验用于机械学研究.

主要成果:

  • 获得了高达95:5 rr,95:5 dr和99% ee. 的佐基环的60-94%的产量.
  • 成功合成了性,完全用碳替代的类固醇基环.
  • 证明了联体对区域选择性和酶选择性的显著电子效应.
  • 提出了一个可信的反应机制,得到实验数据的支持.

结论:

  • 开发的铁催化方法提供了高立体化学控制的复杂基环的高效访问.
  • 配体设计对于调整水化反应的选择性至关重要.
  • 这项研究推进了铁催化在化学中的合成实用性,并提供了机械学的见解.