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Related Concept Videos

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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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

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The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
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Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

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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.
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Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

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Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
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Preparation of Epoxides03:00

Preparation of Epoxides

7.3K
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...
7.3K
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

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Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
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Exclusive macrocyclization through multiple Si-O bond formations from diol and dichlorosilane.

Takahiro Iwamoto1, Sota Amano1, Kousuke Maeda2

  • 1Faculty of Molecular Chemistry and Engineering, Kyoto Institute of Technology, Goshokaido-cho, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan. tiwamoto@kit.ac.jp.

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Summary

This study introduces a highly efficient macrocyclization technique using silicon-oxygen bonds. The method rapidly produces square-shaped cyclic tetramers, even at high concentrations.

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Area of Science:

  • Organosilicon chemistry
  • Macromolecular synthesis

Background:

  • Macrocyclization is crucial for synthesizing complex molecules.
  • Existing methods can be inefficient or require dilute conditions.

Purpose of the Study:

  • To develop a highly efficient macrocyclization method.
  • To explore the formation of cyclic tetramers via Si-O bonds.

Main Methods:

  • Utilizing a reaction between diol and dichlorosilane.
  • Employing multiple Si-O bond formations.
  • Leveraging a hemilabile conformational lock.

Main Results:

  • Exclusive formation of a square-shaped cyclic tetramer.
  • Exceptional efficiency and speed of the synthetic method.
  • Feasibility of the reaction under high concentration conditions.

Conclusions:

  • The described method offers a rapid and efficient route to cyclic tetramers.
  • The conformational lock is key to the exclusive formation of the tetramer.
  • This approach is suitable for large-scale synthesis.