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相关概念视频

[3,3] Sigmatropic Rearrangement of Allyl Vinyl Ethers: Claisen Rearrangement01:24

[3,3] Sigmatropic Rearrangement of Allyl Vinyl Ethers: Claisen Rearrangement

2.1K
The Claisen rearrangement is a [3,3] sigmatropic rearrangement of allyl vinyl ethers to unsaturated carbonyl compounds. The rearrangement is a concerted pericyclic reaction proceeding via a chair-like transition state.
2.1K
Acid Halides to Ketones: Gilman Reagent01:14

Acid Halides to Ketones: Gilman Reagent

2.8K
Lithium dialkyl cuprate, also known as Gilman reagents, selectively reduces acid halides to ketones. The acid chloride is treated with Gilman reagent at −78 °C in the presence of ether solution to produce a ketone in good yield.
As shown below, the mechanism proceeds in two steps. First, one of the alkyl groups of the reagent acts as a nucleophile and attacks the acyl carbon of the acid chloride to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen...
2.8K
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

8.4K
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.
8.4K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.3K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
3.3K
E2 Reaction: Stereochemistry and Regiochemistry02:43

E2 Reaction: Stereochemistry and Regiochemistry

11.5K
Elimination reactions of alkyl halides can yield one or more alkenes depending on the specific regiochemical and stereochemical considerations. While the regiochemistry of the reaction governs the location of the double bond in the product, the stereochemical requirements often influence the geometry.
When a substrate with two different β hydrogens undergoes an E2 elimination, the presence of a strong base can yield two regioisomeric alkenes. The more-substituted alkene is the major...
11.5K
E1 Reaction: Stereochemistry and Regiochemistry02:43

E1 Reaction: Stereochemistry and Regiochemistry

9.5K
One of the critical aspects of the E1 reaction mechanism, as also observed in E2, is the regiochemistry, with multiple regioisomers obtained as products. In the example discussed, the presence of water as a weak base favors elimination over substitution to generate two alkenes. Given that alkenes’ stability increases with the number of alkyl groups across the double bond, typically, E1 reactions lead to the Zaitsev product, for this is more substituted and stable than the Hofmann product.
9.5K

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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
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一个可隔离的THF协调的Dialkylgermanone.

Kazuma Oshima1, Ryo Kobayashi1, Kengo Sakamoto1

  • 1Department of Chemistry, Graduate School of Science, Tohoku University Aoba-ku, Sendai, 980-8578, Japan.

Chemistry, an Asian journal
|February 21, 2024
PubMed
概括

研究人员用二氧化一氧化物合成了一种稳定的dialkylgermanone. 这种化合物可以作为THF添加物分离,表现出类似于西拉诺的反应模式,并经历了关键的转化,如脱氧化和细菌-维蒂格反应.

关键词:
Ge=O 双重债券是指一个双重债券.维蒂格的反应反应.碳基是碳基的组成部分.子 子 子 子

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Highly Stereoselective Synthesis of 1,6-Ketoesters Mediated by Ionic Liquids: A Three-component Reaction Enabling Rapid Access to a New Class of Low Molecular Weight Gelators
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科学领域:

  • 有机金属化学 有机金属化学
  • 主群 化学 化学
  • 低坐标化合物 低坐标化合物

背景情况:

  • 基德尔曼子是短暂的物种,难以分离和研究.
  • 了解低坐标化合物的反应性对于合成应用至关重要.
  • 与类似的化合物进行比较,可以了解周期性趋势.

研究的目的:

  • 为了生成和表征一个稳定的dialkylgermanone.
  • 为了研究合成的dialkylgermanone的反应性.
  • 为了探索dialkylgermanone的协调化学和合成转化.

主要方法:

  • 一个固体dialkylgermylene与气态二氧化 (N2O) 的反应.
  • 隔离的dialkylgermanone作为一个四基 (THF) 添加物.
  • 用各种试剂进行光谱表征和反应性研究 (H2O,THF,B(C6F5) 3,Ph3P,Ph3PCHPh).

主要成果:

  • 成功生成一个稳定的dialkylgermanone.
  • 形成一个可分离的THF协调的dialkylgermanone.
  • 与无基dialkylsilanones相似的反应性,包括脱氧和细菌-Wittig反应.

结论:

  • 稳定的dialkylgermanones可以通过与N2O的反应获得.
  • 与THF的协调稳定了germanone,使其能够被隔离和研究.
  • 反应性概况突出显示了低坐标化合物的合成潜力.