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Preparation of Epoxides03:00

Preparation of Epoxides

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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 peroxy acids to...
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Sharpless Epoxidation02:57

Sharpless Epoxidation

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The conversion of allylic alcohols into epoxides using the chiral catalyst was discovered by K. Barry Sharpless and is known as Sharpless epoxidation. The use of a chiral catalyst enables the formation of one enantiomer of the product in excess. This chiral catalyst is mainly a chiral complex of titanium tetraisopropoxide and tartrate ester (specific stereoisomer). The stereoisomer used in the chiral catalyst dictates the formation of the enantiomer of the product. In other words, the use of...
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Acid-Catalyzed Ring-Opening of Epoxides02:24

Acid-Catalyzed Ring-Opening of Epoxides

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Epoxides that are three-membered ring systems are more reactive than other cyclic and acyclic ethers. The high reactivity of epoxides originates from the strain present in the ring. This ring strain acts as a driving force for epoxides to undergo ring-opening reactions either with halogen acids or weak nucleophiles in the presence of mild acid. The acid catalyst converts the epoxide oxygen, a poor leaving group, into an oxonium ion, a better leaving group, making the reaction feasible. The...
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Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

7.9K
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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Base-Catalyzed Ring-Opening of Epoxides02:26

Base-Catalyzed Ring-Opening of Epoxides

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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...
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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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Related Experiment Video

Updated: Mar 20, 2026

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
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Olefin Epoxidation in Aqueous Phase Using Ionic-Liquid Catalysts.

Mirza Cokoja1, Robert M Reich2, Michael E Wilhelm2

  • 1Catalysis Research Center, Technical University of Munich, Ernst-Otto-Fischer-Str. 1, 85747, Garching bei München, Germany. mirza.cokoja@tum.de.

Chemsuschem
|May 25, 2016
PubMed
Summary
This summary is machine-generated.

Hydrophobic imidazolium-based ionic liquids catalyze olefin epoxidation in water. These catalysts enhance substrate solubility and are easily recycled, offering a green chemistry approach.

Keywords:
epoxidationhomogeneous catalysisionic liquidssolubilitytwo-phase catalysis

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Area of Science:

  • Green Chemistry
  • Catalysis
  • Organic Synthesis

Background:

  • Hydrophobic ionic liquids (ILs) are typically immiscible with aqueous phases.
  • Epoxidation of unfunctionalized olefins often requires harsh conditions or specialized catalysts.
  • Hydrogen peroxide is a desirable oxidant due to its environmentally benign byproduct (water).

Purpose of the Study:

  • To develop efficient and recyclable catalysts for olefin epoxidation in water.
  • To investigate the role of hydrophobic imidazolium-based ionic liquids in aqueous phase reactions.
  • To explore the unique solubility-enhancing properties of these ILs for hydrophobic substrates.

Main Methods:

  • Synthesis of hydrophobic imidazolium-based ionic liquids.
  • Catalytic epoxidation of unfunctionalized olefins using hydrogen peroxide in aqueous solutions.
  • Investigation of catalyst solubility and substrate solubility in the presence of ILs and H2O2.
  • Analysis of catalyst recyclability after the reaction.

Main Results:

  • Hydrophobic imidazolium-based ionic liquids effectively catalyze olefin epoxidation in water using H2O2.
  • The IL catalysts exhibit surprising solubility in aqueous H2O2 solutions due to perrhenate-H2O2 interactions.
  • The presence of the IL catalyst significantly enhances the aqueous solubility of hydrophobic substrates, dependent on cation design.
  • The IL catalyst forms a distinct phase for easy separation and recycling post-reaction.

Conclusions:

  • Imidazolium perrhenates act as dual-function catalysts, facilitating both substrate transfer into the aqueous phase and the epoxidation reaction.
  • This system offers an unprecedented and efficient method for green olefin epoxidation in water.
  • The facile recyclability of the IL catalyst contributes to a sustainable and cost-effective process.