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Acid-Catalyzed Dehydration of Alcohols to Alkenes

Acid-Catalyzed Dehydration of Alcohols to Alkenes

In a dehydration reaction, a hydroxyl group in an alcohol is eliminated along with the hydrogen from an adjacent carbon. Here, the products are an alkene and a molecule of water. Dehydration of alcohols is generally achieved by heating in the presence of an acid catalyst. While the dehydration of primary alcohols requires high temperatures and acid concentrations, secondary and tertiary alcohols can lose a water molecule under relatively mild conditions.

Alkynes to Aldehydes and Ketones: Acid-Catalyzed Hydration

Alkynes to Aldehydes and Ketones: Acid-Catalyzed Hydration

Introduction
Analogous to alkenes, alkynes also undergo acid-catalyzed hydration. While the addition of water to an alkene gives an alcohol, hydration of alkynes produces different products such as aldehydes and ketones.

Aldehydes and Ketones with Water: Hydrate Formation

Aldehydes and Ketones with Water: Hydrate Formation

An oxygen-based nucleophile, like water, can undergo addition reactions with aldehydes and ketones. The reaction leads to the formation of hydrates, also referred to as 1,1-diols or geminal diols.
The formation of hydrates is a reversible reaction. Hydrate formation is influenced by steric and electronic factors accompanying the alkyl substituents on the carbonyl group: The rate of hydrate formation increases with a decrease in the number of alkyl groups attached to the carbonyl carbon. Hence,...

Dehydration Synthesis

Dehydration Synthesis

Overview
Dehydration synthesis (also called a condensation reaction) is the chemical process in which two molecules covalently link together to form a new molecule, along with the release of a water molecule. Many physiologically important compounds form by dehydration synthesis reactions, such as complex carbohydrates, proteins, DNA, and RNA.
Synthesis of carbohydrates
Sugar molecules are covalently linked together by dehydration synthesis. During the reaction, the hydroxyl (-OH) group from...

Hydrolysis

Hydrolysis

Overview
Hydrolysis is a chemical reaction in which the addition of water breaks down a polymer into its simpler monomer units. For example, peptides break into amino acids, carbohydrates into simple sugars, and DNA into nucleotides. Enzymes often facilitate these processes.
Hydrolysis Reverses Dehydration Synthesis
Complex carbohydrates can be broken down by breaking the bonds between individual sugar units. The reaction breaks a glycosidic bond as water is added to the compound. The...

Dehydration of Aldols to Enones: Acid-Catalyzed Aldol Condensation

Dehydration of Aldols to Enones: Acid-Catalyzed Aldol Condensation

As shown in Figure 1, under acidic conditions, the β-hydroxy ketone undergoes dehydration via an E1 elimination reaction to form an enone.

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Updated: Dec 23, 2025

Efficient Synthesis of Polyfunctionalized Benzenes in Water via Persulfate-promoted Benzannulation of α,β-Unsaturated Compounds and Alkynes

Efficient Synthesis of Polyfunctionalized Benzenes in Water via Persulfate-promoted Benzannulation of α,β-Unsaturated Compounds and Alkynes

Published on: December 16, 2019

Dehydration reactions in polyfunctional natural products.

Per Hjerrild¹, Thomas Tørring, Thomas B Poulsen

¹Department of Chemistry, Aarhus University, Langelandsgade 140, DK-8000 Aarhus C, Denmark. thpou@chem.au.dk.

Natural Product Reports

|April 23, 2020

Summary

This review covers state-of-the-art alcohol dehydration methods for creating alkenes. Selective dehydration of alcohols in complex molecules offers new avenues for molecular diversification and exploring bioactivity.

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Enzymatic Cascade Reactions for the Synthesis of Chiral Amino Alcohols from L-lysine

Enzymatic Cascade Reactions for the Synthesis of Chiral Amino Alcohols from L-lysine

Published on: February 16, 2018

Area of Science:

Organic Chemistry
Synthetic Chemistry

Background:

Alcohol dehydration is a fundamental organic transformation.
Existing methods often lack selectivity for complex molecules.
Selective dehydration is key for molecular diversification and accessing novel chemical space.

Purpose of the Study:

To review state-of-the-art dehydration methods for alcohol substrates.
To highlight the potential of selective alcohol dehydration in complex scaffolds.
To identify challenges and future directions in alcohol dehydration chemistry.

Main Methods:

Review of literature up to 2020 on alcohol dehydration reactions.
Analysis of reaction mechanisms involving activation and elimination steps.
Discussion of challenging substrates and their implications for synthetic strategies.

Main Results:

Established methods for alcohol dehydration typically involve activation and elimination.
Selective dehydration of alcohols in complex structures remains a significant challenge.
Nature-inspired approaches offer potential for direct and selective transformations.

Conclusions:

Developing selective dehydration methods for complex alcohols is crucial.
Such methods will enable the generation of novel molecular constructs.
Advancements in this area will be highly valued by synthetic and natural product chemists.