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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.

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.

Structure and Nomenclature of Thiols and Sulfides

Structure and Nomenclature of Thiols and Sulfides

Thiols and sulfides are sulfur analogs of alcohols and ethers, respectively, where the sulfur atom takes the place of the oxygen atom. Thus, thiols are generally represented as RSH, where R is an alkyl substituent and —SH is the functional group. On the other hand, in sulfides, the central sulfur atom is bonded to two hydrocarbon groups on either side. Depending upon the type of group, sulfides can be either symmetrical or asymmetrical. Both thiols and sulfides display a bent geometry, similar...

Microbes and the Sulfur Cycle

Microbes and the Sulfur Cycle

Sulfur is a vital element in Earth's biogeochemical systems. It transitions through various inorganic states, including sulfate (SO₄²⁻), elemental sulfur (S⁰), and sulfide (S²⁻). Abiotic and biological mechanisms across oxic and anoxic environments intricately mediate these transformations. Sulfate, the most oxidized form of sulfur, is predominantly stored in rocks, marine sediments, and oceanic waters, acting as a long-term reservoir in the global sulfur cycle.In oxic environments,...

Sulfur Assimilation

Sulfur Assimilation

Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to become...

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Related Experiment Video

Updated: May 11, 2026

A Sensitive Visual Method for the Detection of Hydrogen Sulfide Producing Bacteria

A Sensitive Visual Method for the Detection of Hydrogen Sulfide Producing Bacteria

Published on: June 27, 2022

Light-induced hydrogen sulfide release from "caged" gem-dithiols.

Nelmi O Devarie-Baez¹, Powell E Bagdon, Bo Peng

¹Department of Chemistry, Washington State University, Pullman, Washington 99164, USA.

Organic Letters

|May 24, 2013

Summary

New "caged" gem-dithiol compounds release hydrogen sulfide (H2S) when exposed to light. These novel H2S donors were confirmed using spectroscopic methods to generate H2S in various environments, including cell cultures.

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Measurement of H2S in Crude Oil and Crude Oil Headspace Using Multidimensional Gas Chromatography, Deans Switching and Sulfur-selective Detection

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Published on: December 10, 2015

Area of Science:

Photochemistry
Chemical Biology
Organic Synthesis

Background:

Hydrogen sulfide (H2S) is a crucial signaling molecule in biological systems.
Developing controlled H2S delivery systems is essential for studying its physiological roles.
Existing methods for H2S generation often lack spatial or temporal control.

Purpose of the Study:

To synthesize and characterize novel "caged" gem-dithiol derivatives.
To demonstrate light-induced release of H2S from these compounds.
To validate the efficacy of these compounds as H2S donors in aqueous and biological media.

Main Methods:

Synthesis of "caged" gem-dithiol derivatives.
Spectroscopic analysis (e.g., UV-Vis, NMR) to confirm structure and H2S release.
Cell culture experiments to assess H2S generation in a biological context.

Main Results:

Successful synthesis of a new class of "caged" gem-dithiol compounds.
Confirmation of light-triggered H2S release.
Demonstration of H2S generation in both aqueous/organic mixtures and cell cultures.

Conclusions:

"Caged" gem-dithiol derivatives represent a viable new platform for controlled H2S delivery.
These compounds offer a spatiotemporally controlled method for releasing H2S.
The developed compounds have potential applications in chemical biology and therapeutic strategies involving H2S.