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Preparation and Reactions of Thiols02:33

Preparation and Reactions of Thiols

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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.
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Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

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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.
5.1K
Structure and Nomenclature of Thiols and Sulfides02:17

Structure and Nomenclature of Thiols and Sulfides

5.1K
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,...
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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

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Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
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The Z-Scheme of Electron Transport in Photosynthesis01:34

The Z-Scheme of Electron Transport in Photosynthesis

10.6K
The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
10.6K
Sulfur Assimilation01:20

Sulfur Assimilation

80
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...
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Photoskunks: molecules for light-induced thiol generation.

Andrey V Stepanov1,2, Alexandra A Shatrova1,2, Daria V Berdnikova3,4

  • 1A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, 664033 Irkutsk, Russian Federation. lvov-andre@yandex.ru.

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|June 9, 2025
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Summary

Researchers review "photoskunks," molecules that generate thiols upon light exposure. This includes reversible and irreversible transformations, offering new ways to control thiol generation for various applications.

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Area of Science:

  • Organic Chemistry
  • Photochemistry
  • Materials Science

Background:

  • Thiols are crucial organosulfur compounds with diverse applications in synthesis, biology, and materials.
  • Controllable light-induced generation of thiols is a significant challenge in modern chemistry.

Purpose of the Study:

  • To review the development of molecular tools for light-induced thiol generation.
  • To outline the current state, challenges, and future perspectives in this field.

Main Methods:

  • Classification of photoskunks into three types based on phototransformation mechanisms.
  • Analysis of reversible phototransformations using photoswitches like spirothiopyrans and aza-diarylethenes.
  • Examination of irreversible phototransformations involving diarylethenes and o-thiopyrinidylbenzaldehydes.
  • Discussion of photocages with photocleavable protecting groups for C-S bond scission.

Main Results:

  • Identification of three distinct classes of photoskunks based on their photochemical behavior.
  • Demonstration of reversible thiol generation/caging via photoswitch mechanisms.
  • Highlighting irreversible thiol formation pathways.
  • Exploration of photocleavable protecting groups for controlled thiol release.

Conclusions:

  • Photoskunks represent a versatile class of photofunctional molecules for thiol generation.
  • Advances in this field offer precise control over thiol chemistry using light stimuli.
  • Significant potential exists for future interdisciplinary applications in synthesis, biology, and materials science.