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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

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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.
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Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

2.2K
Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
2.2K
Hydroboration-Oxidation of Alkenes03:08

Hydroboration-Oxidation of Alkenes

11.0K
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.
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Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule02:17

Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule

16.1K
If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
The hydrohalogenation of an unsymmetrical alkene can yield two haloalkane products, depending on which vinylic carbon takes up the halogen. However, one product usually predominates, where hydrogen adds to the vinylic carbon bearing the...
16.1K
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

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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.
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机器学习用于甲醇-对-烯反应中的时间分辨率选择性分析.

Tenghao Xi1, Miao Yang2, Xiaoguang Wang1

  • 1School of Mathematical Sciences, Dalian University of Technology, Dalian 116024, P. R. China.

Journal of chemical information and modeling
|December 11, 2025
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此摘要是机器生成的。

本研究引入了一种机器学习框架,用于准确地建模甲醇-烯 (MTO) 反应中的时间依赖的产品选择性. 新方法捕捉了功能轨迹,改善了煤炭化学过程中乙烯和烯选择性的预测.

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科学领域:

  • 化学工程是化学工程的重要组成部分.
  • 催化科学 催化科学
  • 机器学习应用 机器学习应用

背景情况:

  • 甲醇到烯酸 (MTO) 过程在煤炭化学工业中至关重要,但表现出复杂的,时间依赖的产品选择性.
  • 传统的数据驱动模型难以捕捉乙烯/选择性的时间演变,通常将其视为标量数据而不是功能数据.

研究的目的:

  • 开发一个统一的机器学习 (ML) 框架,用于在MTO反应中建模时间解析的选择性曲线.
  • 将产品选择性表示为功能轨迹,而不是简化的标量输出.

主要方法:

  • 使用直角基础扩展来将无限维的功能数据转换为有限维的基础系数.
  • 利用基于树的ML模型来学习输入到基础的系数映射.
  • 在模型培训中应用了两种不同的损失最小化策略.

主要成果:

  • 实现了高预测准确性,测试组R2值为时间解析的选择性曲线高达0.9.
  • 确定了乙烯和的选择性的关键决定因素,包括热带石的特性 (最大的自由球体直径,酸密度,晶体大小) 和工艺参数 (框架密度,空间速度).
  • 发现的特定影响:最大的环形大小对乙烯选择性,框架密度/空间速度对烯选择性.

结论:

  • 拟议的ML框架提供了一个强大的方法,用于模拟催化反应中的功能输出.
  • 这种方法提供了一个可转移的范式,用于分析化学过程中的复杂的时间依赖现象.
  • 这些发现提高了对MTO反应机制和催化剂设计的理解.