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相关概念视频

Preparation of Epoxides03:00

Preparation of Epoxides

7.5K
Overview
Epoxides result from alkene oxidation, which can be achieved by a) air, b) peroxy acids, c) hypochlorous acids, and d) halohydrin cyclization.
Epoxidation with Peroxy Acids
Epoxidation of alkenes via oxidation with peroxy acids involves the conversion of a carbon–carbon double bond to an epoxide using the oxidizing agent meta-chloroperoxybenzoic acid, commonly known as MCPBA. Since the O–O bond of peroxy acids is very weak, the addition of electrophilic oxygen of...
7.5K
Structure and Nomenclature of Epoxides02:38

Structure and Nomenclature of Epoxides

6.3K
Cyclic ethers are heterocyclic compounds with an oxygen atom in the ring along with carbon atoms. They are named depending on the number of carbon atoms present in their ring system. Cyclic ethers with a three-membered ring system are called “oxirane”, four-membered ring systems as “oxetane”, five-membered ring systems as “oxolane”, and six-membered ring systems as “oxane”. The cyclic structure of these rings imposes angle strain, and this strain...
6.3K
Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

2.5K
Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
2.5K
Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

3.5K
Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
3.5K
Base-Catalyzed Ring-Opening of Epoxides02:26

Base-Catalyzed Ring-Opening of Epoxides

8.3K
Due to their highly strained structures, epoxides can readily undergo ring-opening reactions through nucleophilic substitution, either in the presence of an acid or a base. The nucleophilic substitution reactions in the presence of acid are called acid-catalyzed ring-opening reactions, and nucleophilic substitution reactions in the presence of a base are called base-catalyzed ring-opening reactions. Epoxides undergo base-catalyzed ring-opening reactions in the presence of a strong nucleophile...
8.3K
Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation01:27

Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation

2.1K
Robinson annulation is a base-catalyzed reaction for the synthesis of 2-cyclohexenone derivatives from 1,3-dicarbonyl donors (such as cyclic diketones, β-ketoesters, or β-diketones) and α,β-unsaturated carbonyl acceptors. Named after Sir Robert Robinson, who discovered it, this reaction yields a six-membered ring with three new C–C bonds (two σ bonds and one π bond).
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相关实验视频

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Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
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Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework

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循环氧基聚合物更新:基于循环基的开放框架的构建模块

Maxence Lion1, Jérôme Marrot1, William Shepard2

  • 1Institut Lavoisier de Versailles, CNRS, UVSQ, Université Paris-Saclay, 45 avenue des Etats-Unis, 78035, Versailles, France.

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概括

这项研究引入了一种新的混乱基架,使用-硫复合体来结晶混合有机-无机材料与环氧. 不同的环极素产生不同的结构,推进了超分子设计.

关键词:
混变效应是一种混变效应.循环德克斯特林 (Cyclodextrin) 是一种循环德克斯特林.混合框架 混合框架波利尼安的意思是聚.在X射线中,X射线结构结构是什么?

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Solid-phase Synthesis of [4.4] Spirocyclic Oximes
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科学领域:

  • 超分子化学 超分子化学
  • 无机化学 无机化学
  • 材料科学 材料科学 材料科学

背景情况:

  • 溶解过程在生物自我组装中至关重要,但在晶体材料设计中未得到充分利用.
  • 混合有机-无机系统通过结合不同的构建块提供独特的特性.

研究的目的:

  • 开发一种新的混沌基架,用于结晶混合有机-无机系统.
  • 调查环氧在这些结构的模板化中的作用.
  • 探索-硫复合物的自我组装行为.

主要方法:

  • [Mo8S8O8(OH) 8(客) ]2-复合物的合成.
  • 用α-和β-环氧德克斯特林结晶.
  • 使用X射线衍射 (粉末和单晶),N2吸附,元素分析,热重力测量分析进行表征.
  • 溶液研究包括1H NMR定位和小角度X射线散射 (SAXS).

主要成果:

  • 使用新型脚手架成功形成混合有机-无机晶体架构.
  • 贝塔-环极素 (β-CD) 促进了宿主-客人复合体的形成.
  • 阿尔法-环极素 (α-CD) 诱导了Kagome类型的结构,具有显著的空隙.
  • 建筑单元在溶液中的预联的证据.

结论:

  • [Mo8S8O8(OH8(客人) ]2-复合体作为一种有效的杂热基架,用于超分子结晶.
  • 循环质蛋白起到关键的模板作用,指导不同结构图案的形成.
  • 这项工作为无机聚离子-环氧氨酸超分子组件的设计原则提供了新的见解.