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Ethers from Alcohols: Alcohol Dehydration and Williamson Ether Synthesis

Ethers from Alcohols: Alcohol Dehydration and Williamson Ether Synthesis

Overview
Ethers can be prepared from organic compounds by various methods. Some of them are discussed below,
Preparation of Ethers by Alcohol Dehydration
In this method, in the presence of protic acids, alcohol dehydrates to produce alkenes and ethers under different conditions. For example, in the presence of sulphuric acid, dehydration of ethanol at 413 K yields ethoxyethane, whereas it yields ethene at 443 K.

Ethers to Alkyl Halides: Acidic Cleavage

Ethers to Alkyl Halides: Acidic Cleavage

Ethers are generally unreactive and unsuitable for direct nucleophilic substitution reactions since the alkoxy groups are strong bases and, therefore, poor leaving groups. However, ethers readily undergo acidic-cleavage reactions. Ethers can be converted to alkyl halides when heated with strong acids such as HBr and HI in a sequence of two substitution reactions.

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...

Structure and Nomenclature of Ethers

Structure and Nomenclature of Ethers

Structure and Bonding
Ethers are organic compounds with an ether functional group which is characterized by an oxygen atom connected to two — identical or different — alkyl, aryl, or vinyl groups. The C–O–C linkage in dimethyl ether — the simplest ether — has an approximately tetrahedral bond angle of 110.3 degrees. The oxygen atom is sp3- hybridized, with the C–O distance being about 140 pm.
Classification of Ethers
Based on their attached substituent...

Ethers from Alkenes: Alcohol Addition and Alkoxymercuration-Demercuration

Ethers from Alkenes: Alcohol Addition and Alkoxymercuration-Demercuration

Overview
Ethers can also be prepared from alkenes through acid-catalyzed addition of alcohols and alkoxymercuration–demercuration.
Preparation of Ethers by Acid-Catalyzed Addition of Alcohol to Alkenes
The acid-catalyzed addition of alcohol to an alkene involves treating the alkene with an excess of alcohol in the presence of an acid catalyst to form an ether under suitable conditions. The hydrogen will add to the less substituted carbon so that the nucleophile can attack the more...

Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule

Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule

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...

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Related Experiment Video

Updated: Apr 21, 2026

Efficient Synthesis of All-Carbon Quaternary Centers via the Conjugate Addition of Functionalized Monoorganozinc Bromides

Efficient Synthesis of All-Carbon Quaternary Centers via the Conjugate Addition of Functionalized Monoorganozinc Bromides

Published on: May 26, 2019

Practical and highly selective C-H functionalization of structurally diverse ethers.

Miao Wan¹, Zhilin Meng, Hongxiang Lou

¹Key Lab of Chemical Biology of Ministry of Education, School of Pharmaceutical Sciences, Shandong University, Jinan 250012 (China).

Angewandte Chemie (International Ed. in English)

|October 28, 2014

Summary

A novel trityl ion method enables C-H functionalization of ethers using various nucleophiles at room temperature. This efficient protocol precisely creates complex cyclic ethers like tetrahydrofurans and tetrahydropyrans.

Keywords:

CH functionalization Lewis acid boron ethers regioselectivity

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Last Updated: Apr 21, 2026

Efficient Synthesis of All-Carbon Quaternary Centers via the Conjugate Addition of Functionalized Monoorganozinc Bromides

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Published on: May 26, 2019

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Area of Science:

Organic Chemistry
Synthetic Chemistry

Background:

C-H functionalization is a key strategy in organic synthesis.
Developing selective methods for ether modification remains a challenge.

Purpose of the Study:

To develop a novel trityl ion-mediated C-H functionalization of ethers.
To achieve high selectivity and functional group tolerance in ether synthesis.

Main Methods:

Utilized trityl ion catalysis for C-H activation of ethers.
Employed a wide range of nucleophiles under ambient temperature conditions.

Main Results:

Achieved high chemoselectivity and functional group tolerance.
Demonstrated excellent regio- and diastereoselectivity for unsymmetric ethers.
Stereoselectively synthesized functionalized tetrahydrofurans, tetrahydropyrans, dihydropyrans, and isochromans.

Conclusions:

The developed protocol offers an efficient route for synthesizing complex cyclic ethers.
Highlights the utility of trityl ion catalysis in stereoselective synthesis.
Provides a valuable tool for complex molecule synthesis.