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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.

Nomenclature of Alkynes

Nomenclature of Alkynes

Alkynes are unsaturated hydrocarbons characterized by the presence of carbon-carbon triple bonds and have a general formula CnH2n-2. The nomenclature of alkynes follows a set of rules similar to alkanes and alkenes; however, alkynes bear the suffix "-yne" instead of "-ane" or "-ene." There are two approaches to naming alkynes:

Cycloaddition Reactions: Overview

Cycloaddition Reactions: Overview

Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.

Preparation of 1° Amines: Azide Synthesis

Preparation of 1° Amines: Azide Synthesis

Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...

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...

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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Updated: Jan 28, 2026

Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units

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Published on: September 18, 2016

Green Methodologies for Copper(I)-Catalyzed Azide-Alkyne Cycloadditions: A Comparative Study.

Marissa Trujillo¹, Clayton Hull-Crew², Andrew Outlaw³

¹Department of Chemistry and Biochemistry, University of Colorado Colorado Springs, Colorado Springs, CO 80918, USA. mtrujil3@uccs.edu.

Molecules (Basel, Switzerland)

|March 13, 2019

Summary

Copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) reactions were compared using four methods. Microwave heating offers a superior approach for synthesizing triazole products efficiently.

Keywords:

1H-1,2,3-triazole copper-catalyzed azide-alkyne cycloaddition (CuAAC)fluorotriazole green chemistry microwave heating solvent-free reaction

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Area of Science:

Organic Chemistry
Medicinal Chemistry

Background:

Copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) is a key reaction in synthesizing 1H-1,2,3-triazoles.
Various synthetic methods exist for CuAAC, each with potential advantages and disadvantages.

Purpose of the Study:

To compare four distinct synthetic protocols for CuAAC reactions.
To evaluate the efficiency of each method based on reaction time, product yield, and purity.

Main Methods:

Conventional heating method
Microwave-assisted heating method
Solvent-free reaction conditions
Glycerol as a reaction solvent

Main Results:

The microwave heating method demonstrated the fastest reaction times.
All tested methods yielded high purity 1H-1,2,3-triazole products.
Both known non-fluorinated and novel fluorinated triazoles were successfully synthesized.

Conclusions:

Microwave-assisted synthesis is highly recommended for efficient CuAAC reactions.
The choice of method can be optimized based on specific synthetic goals.
Further research into fluorinated triazole synthesis is warranted.