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Acid Halides to Esters: Alcoholysis

Acid Halides to Esters: Alcoholysis

Alcoholysis is a nucleophilic acyl substitution reaction in which an alcohol functions as a nucleophile. Acid halides react with alcohol to produce esters. The mechanism proceeds in three steps:

Acid Halides to Carboxylic Acids: Hydrolysis

Acid Halides to Carboxylic Acids: Hydrolysis

Hydrolysis of acid halides is a nucleophilic acyl substitution reaction in which acid halides react with water to give carboxylic acids. The reaction occurs readily and does not require acid or a base catalyst.
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic...

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

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The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.

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,...

Preparation of Alcohols via Addition Reactions

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Overview
The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...

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.

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Updated: Apr 4, 2026

Microwave-Assisted Preparation of 1-Aryl-1H-pyrazole-5-amines

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Published on: June 23, 2019

Accelerated Synthesis of Pyrazoles Mediated by Water Microdroplets.

Manish Jana¹, Keerthana Unni^2,1, Thalappil Pradeep²

¹Department of Chemistry, Purdue University, West Lafayette, Indiana 47907.

ACS Sustainable Chemistry & Engineering

|April 3, 2026

Summary

This study presents a green, fast, and efficient method for synthesizing pyrazoles using water microdroplets. The novel approach avoids catalysts and harsh conditions, offering a sustainable alternative for producing these important compounds.

Keywords:

Catalyst-free Microdroplets Pyrazole Synthesis Scalable Sustainable

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Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach

Published on: June 10, 2021

Area of Science:

Organic Chemistry
Green Chemistry
Physical Chemistry

Background:

Pyrazoles are crucial in synthesis, food science, and medicine.
Traditional pyrazole synthesis often requires catalysts, organic solvents, and high temperatures.
Existing methods can be time-consuming and environmentally taxing.

Purpose of the Study:

To develop an environmentally friendly and efficient method for synthesizing pyrazoles and their derivatives.
To utilize the unique properties of water microdroplets under electric fields for organic synthesis.
To offer a rapid, catalyst-free alternative to conventional pyrazole synthesis.

Main Methods:

Synthesis of pyrazoles and derivatives in aqueous microdroplets using electric fields.
Investigation of reaction mechanisms, including the role of water and interfacial effects.
Characterization of synthesized pyrazoles using Nuclear Magnetic Resonance (NMR) and Mass Spectrometry (MS/MS).

Main Results:

Eight different substituted pyrazoles were synthesized with moderate to excellent yields.
The microdroplet reaction proceeded rapidly, typically on the millisecond timescale.
A scaled-up reaction demonstrated a synthesis rate of 0.81 mg/min.
Evidence suggests an interfacial mechanism driven by the inherent acidity of microdroplet surfaces.

Conclusions:

Aqueous microdroplets under electric fields provide a green and efficient platform for pyrazole synthesis.
The method circumvents the need for external catalysts and organic solvents.
The reaction mechanism involves surface acidity and dehydration at the gas-liquid interface of microdroplets.