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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...

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,...

[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.

Diels–Alder Reaction: Characteristics of Dienes

Diels–Alder Reaction: Characteristics of Dienes

The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is more stable,...

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

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.

Carboxylic Acids to Methylesters: Alkylation using Diazomethane

Carboxylic Acids to Methylesters: Alkylation using Diazomethane

Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.

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Related Experiment Video

Updated: Dec 27, 2025

Bio-inspired Polydopamine Surface Modification of Nanodiamonds and Its Reduction of Silver Nanoparticles

Bio-inspired Polydopamine Surface Modification of Nanodiamonds and Its Reduction of Silver Nanoparticles

Published on: November 14, 2018

Facile diamond synthesis from lower diamondoids.

Sulgiye Park^1,2, Iwnetim I Abate^2,3, Jin Liu^1,4

¹Department of Geological Sciences, Stanford University, Stanford, CA 94305, USA.

Science Advances

|March 5, 2020

Summary

Diamondoids, diamond-like hydrocarbons, offer a new pathway for synthesizing diamond under lower pressures and temperatures. This discovery significantly reduces the energy barrier for creating diamond from these unique carbon precursors.

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$Synthesis and Microdiffraction at Extreme Pressures and Temperatures$

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Bio-inspired Polydopamine Surface Modification of Nanodiamonds and Its Reduction of Silver Nanoparticles

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Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis

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$Synthesis and Microdiffraction at Extreme Pressures and Temperatures$

Synthesis and Microdiffraction at Extreme Pressures and Temperatures

Published on: October 7, 2013

Area of Science:

Materials Science
Nanotechnology
Diamond Synthesis

Background:

Carbon-based nanomaterials possess unique properties for technological use.
Diamond synthesis typically requires extreme conditions.
Diamondoids are saturated hydrocarbons with diamond-like structures.

Purpose of the Study:

To investigate diamondoids as precursors for laser-induced diamond synthesis.
To determine the pressure-temperature (P-T) conditions for diamondoid-to-diamond conversion.
To understand the kinetics and mechanisms of this transformation.

Main Methods:

Laser-induced high-pressure, high-temperature experiments.
Molecular dynamics simulations.
Analysis of P-T phase diagrams for diamond synthesis.

Main Results:

Diamond synthesis achieved from diamondoids at significantly reduced P-T conditions (e.g., 12 GPa at ~2000 K, 900 K at ~20 GPa).
Diamondoid-to-diamond conversion observed to be rapid (<19 μs at 20 GPa).
Simulations show dehydrogenated diamondoid cages reconstruct into diamond structures.

Conclusions:

Diamondoids are effective precursors for diamond synthesis, lowering the transformation barrier.
The structural and electronic similarity between diamondoids and diamond facilitates conversion.
This study maps the P-T conditions and timing for diamondoid-to-diamond conversion, revealing key facilitating factors.