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Structure and Nomenclature of Epoxides

Structure and Nomenclature of Epoxides

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 is more in the ring having a smaller number of...

Preparation of Epoxides

Preparation of Epoxides

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...

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

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

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.

Acid-Catalyzed Ring-Opening of Epoxides

Acid-Catalyzed Ring-Opening of Epoxides

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...

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...

Base-Catalyzed Ring-Opening of Epoxides

Base-Catalyzed Ring-Opening of Epoxides

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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Related Experiment Video

Updated: May 31, 2026

Enzymatic Synthesis of Epoxidized Metabolites of Docosahexaenoic, Eicosapentaenoic, and Arachidonic Acids

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(3R,6R,12R,20S,24R)-20,24-Ep-oxy-dammarane-3,6,12,25-tetra-ol.

Lei Zhang, Huan-Mei Guo, Wen-Juan Li

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Summary

This study details the molecular conformation of a C(30)H(52)O(5) compound, revealing specific ring structures and hydrogen bonding patterns. These findings elucidate the molecule's three-dimensional arrangement in its crystalline state.

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Area of Science:

Organic Chemistry
Crystallography
Molecular Structure

Background:

Understanding molecular conformation is crucial for predicting chemical behavior.
C(30)H(52)O(5) represents a complex organic molecule with potential applications.

Purpose of the Study:

To determine the precise three-dimensional structure of the title compound.
To investigate the role of intra-molecular and inter-molecular hydrogen bonds on molecular conformation.

Main Methods:

X-ray crystallography was employed to analyze the crystal structure.
Conformational analysis of the various ring systems within the molecule.

Main Results:

The compound exhibits distinct ring conformations: chair for six-membered rings, envelope for the five-membered ring, and an intermediate form for the tetrahydrofuran ring.
Intra-molecular hydrogen bonds likely influence the molecule's conformation.
Inter-molecular hydrogen bonds create a three-dimensional network in the crystal.

Conclusions:

The study provides a detailed structural elucidation of the C(30)H(52)O(5) compound.
Hydrogen bonding plays a significant role in both intra-molecular stability and crystal packing.