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相关概念视频

Synthesis of α-Substituted Carbonyl Compounds: The Stork Enamine Reaction01:26

Synthesis of α-Substituted Carbonyl Compounds: The Stork Enamine Reaction

3.4K
α-Substituted ketones or aldehydes can be synthesized from enamines by the Stork enamine reaction, named after its pioneer Gilbert Stork. Enamines are useful synthetic intermediates where the lone pair on nitrogen is in conjugation with the C=C bond. They resemble enolate ions, as the resonance forms of both species have a nucleophilic α carbon.
3.4K
SN2 Reaction: Stereochemistry02:23

SN2 Reaction: Stereochemistry

9.5K
In an SN2 reaction, the nucleophilic attack on the substrate and departure of the leaving group occurs simultaneously through a transition state. As the nucleophile approaches the substrate from the back-side, the configuration of the substrate carbon changes from tetrahedral to trigonal bipyramidal and then back to tetrahedral, leading to an inversion in the configuration of the product.
If the substrate is an achiral molecule at the α-carbon, the inversion of configuration is not...
9.5K
E1 Reaction: Stereochemistry and Regiochemistry02:43

E1 Reaction: Stereochemistry and Regiochemistry

9.4K
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.
9.4K
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
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

2.4K
Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
2.4K
SN2 Reaction: Kinetics02:14

SN2 Reaction: Kinetics

8.3K
Kinetic Studies and Significance
In a chemical reaction, a relationship exists between the concentration of reactants and the rate at which the reaction proceeds. The study to measure this relationship is known as the kinetics of a chemical reaction. Kinetic studies are used to deduce the rate law of a chemical reaction, which provides information about the species involved during the transition state of the rate-determining step. Thus, kinetic studies help to derive the mechanism of a...
8.3K

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Updated: Jun 24, 2025

Solid-phase Synthesis of [4.4] Spirocyclic Oximes
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Solid-phase Synthesis of [4.4] Spirocyclic Oximes

Published on: February 6, 2019

6.8K

在回复合成问题上比较搜索算法.

Milo Roucairol1, Tristan Cazenave1

  • 1LAMSADE, Université Paris Dauphine - PSL, Paris, France.

Molecular informatics
|June 12, 2024
PubMed
概括
此摘要是机器生成的。

新的算法,嵌套的蒙特卡罗搜索和贪的最佳首次搜索,在使用AiZynthFinder的回归合成预测中超过了标准的蒙特卡罗树搜索. 进一步的改进取决于提高政策网络的质量.

关键词:
这是一个MCTS系统.蒙特卡罗树搜索 蒙特卡罗树搜索复杂合成的复杂合成搜索算法 搜索算法 搜索算法

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Curation of Computational Chemical Libraries Demonstrated with Alpha-Amino Acids
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Curation of Computational Chemical Libraries Demonstrated with Alpha-Amino Acids

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Chemoselective Preparation of 1-Iodoalkynes, 1,2-Diiodoalkenes, and 1,1,2-Triiodoalkenes Based on the Oxidative Iodination of Terminal Alkynes
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Chemoselective Preparation of 1-Iodoalkynes, 1,2-Diiodoalkenes, and 1,1,2-Triiodoalkenes Based on the Oxidative Iodination of Terminal Alkynes

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相关实验视频

Last Updated: Jun 24, 2025

Solid-phase Synthesis of [4.4] Spirocyclic Oximes
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Solid-phase Synthesis of [4.4] Spirocyclic Oximes

Published on: February 6, 2019

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Curation of Computational Chemical Libraries Demonstrated with Alpha-Amino Acids
08:21

Curation of Computational Chemical Libraries Demonstrated with Alpha-Amino Acids

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Chemoselective Preparation of 1-Iodoalkynes, 1,2-Diiodoalkenes, and 1,1,2-Triiodoalkenes Based on the Oxidative Iodination of Terminal Alkynes
09:54

Chemoselective Preparation of 1-Iodoalkynes, 1,2-Diiodoalkenes, and 1,1,2-Triiodoalkenes Based on the Oxidative Iodination of Terminal Alkynes

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科学领域:

  • 计算化学是一种计算化学.
  • 人工智能在药物发现中的作用

背景情况:

  • 反合成对于合成路线规划至关重要.
  • AiZynthFinder是一个开源工具,用于回合成分析.
  • 在AiZynthFinder中评估和改进搜索算法对于其有效性至关重要.

研究的目的:

  • 为了比较嵌套蒙特卡罗搜索 (NMCS) 和贪最佳首次搜索 (GBFS) 与AiZynthFinder中的基础蒙特卡罗树搜索 (MCTS) 的性能.
  • 评估不同搜索算法对回合成预测准确性和效率的影响.
  • 识别限制和改善AiZynthFinder搜索能力的未来方向.

主要方法:

  • 在AiZynthFinder框架内实施和测试NMCS和GBFS算法.
  • 使用由拜耳化学家从PubChem数据库中策划的基准数据集.
  • 对NMCS,GBFS和基础MCTS性能指标进行比较分析.

主要成果:

  • 在回合成预测中,NMCS和GBFS都表现出与基MCTS相比的优异性能.
  • NMCS在GBFS上显示出轻微的优势,特别是在实验季后赛启发式时.
  • 发现所有测试的搜索算法的性能都受到底层政策网络的质量限制.

结论:

  • 与使用AiZynthFinder进行回合成的标准MCTS相比,NMCS和GBFS具有显著的改进.
  • 加强政策网络被认为是进一步提高预测准确性的关键下一步.
  • 这项研究为优化人工智能驱动的回合成规划工具提供了有价值的见解.