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Preparation and Reactions of Sulfides

Preparation and Reactions of Sulfides

Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.

Preparation and Reactions of Thiols

Preparation and Reactions of Thiols

Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.

Electrophilic Aromatic Substitution: Sulfonation of Benzene

Electrophilic Aromatic Substitution: Sulfonation of Benzene

Sulfonation of benzene is a reaction wherein benzene is treated with fuming sulfuric acid at room temperature to produce benzenesulfonic acid. Fuming sulfuric acid is a mixture of sulfur trioxide and concentrated sulfuric acid.

Rate-Determining Steps

Rate-Determining Steps

Relating Reaction Mechanisms
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
The concept of rate-determining step can be understood from the analogy of a 4-lane freeway with a short-stretch of traffic-bottleneck caused due to...

SN2 Reaction: Kinetics

S_N2 Reaction: Kinetics

Kinetic Studies and Significance
In a chemical reaction, a relationship exists between the concentration of reactants and the rate at which the reaction proceeds. The study to measure this relationship is known as the kinetics of a chemical reaction. Kinetic studies are used to deduce the rate law of a chemical reaction, which provides information about the species involved during the transition state of the rate-determining step. Thus, kinetic studies help to derive the mechanism of a reaction.

SN2 Reaction: Mechanism

S_N2 Reaction: Mechanism

The kinetic studies of SN2 reactions suggest an essential feature of its mechanism: it is a single-step process without intermediates. Here, both the nucleophile and the substrate participate in the rate-determining step.
The presence of the more electronegative halogen in the substrate creates a polarized carbon-halide bond. The halide pulls the electron cloud generating an electrophilic center at the carbon atom. Thus, the carbon atom carries a partial positive charge while the halide has a...

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Related Experiment Video

Updated: Jul 10, 2026

Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-(phosphinetriyl)tripiperidine]}palladium Under Mild Reaction Conditions

Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-(phosphinetriyl)tripiperidine]}palladium Under Mild Reaction Conditions

Published on: March 20, 2014

Mechanochemical Sulfur-Phenolate Exchange Click Reactions.

Zitong Hao¹, Lanping Meng¹, Yaxin Wang¹

¹School of Pharmaceutical Science and Technology, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, P. R. China.

The Journal of Organic Chemistry

|July 8, 2026

Summary

This summary is machine-generated.

This study presents a solvent-free mechanochemical method for the sulfur(VI)-phenolate exchange reaction (SuPhenEx). This green chemistry approach achieves high yields, demonstrating potential for sustainable synthesis.

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Last Updated: Jul 10, 2026

Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-(phosphinetriyl)tripiperidine]}palladium Under Mild Reaction Conditions

Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-(phosphinetriyl)tripiperidine]}palladium Under Mild Reaction Conditions

Published on: March 20, 2014

Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework

Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework

Published on: April 9, 2018

Area of Science:

Green Chemistry
Organic Synthesis
Mechanochemistry

Background:

Solvent use in chemical reactions impacts sustainability.
Efficient reactions like click chemistry often overlook solvent effects.
Mechanochemistry offers solvent-free alternatives for synthesis.

Purpose of the Study:

To develop a sustainable, solvent-free mechanochemical method for the sulfur(VI)-phenolate exchange reaction (SuPhenEx).
To demonstrate the efficiency and broad applicability of this green approach.

Main Methods:

Utilized a solvent-free mechanochemical technique.
Investigated the sulfur(VI)-phenolate exchange reaction (SuPhenEx).
Employed 4-nitrophenyl sulfonate esters reacting with phenols, alcohols, amines, and anilines.

Main Results:

Achieved high yields in the SuPhenEx reaction under solvent-free conditions.
Demonstrated the reaction's efficiency with diverse nucleophiles including phenols, alcohols, amines, and anilines.
Successfully performed gram-scale syntheses, proving scalability.

Conclusions:

The mechanochemical SuPhenEx reaction is a fast, eco-friendly, and efficient alternative to traditional solvent-based methods.
This approach holds significant promise for broader applications in sustainable and green chemistry.
Highlights the importance of considering solvent-free methods in evaluating reaction sustainability.