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Related Concept Videos

Preparation and Reactions of Thiols02:33

Preparation and Reactions of Thiols

6.2K
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.
6.2K
Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

4.8K
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.
4.8K
Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride01:26

Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride

1.8K
Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation...
1.8K
Structure and Nomenclature of Thiols and Sulfides02:17

Structure and Nomenclature of Thiols and Sulfides

4.7K
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,...
4.7K
Radical Formation: Homolysis00:54

Radical Formation: Homolysis

3.6K
A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
3.6K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

42.4K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
42.4K

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Updated: Jun 27, 2025

Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
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Chromium-Thiolate Complex Undergoing C-S Bond Cleavage.

Kaiji Shen1, Marcello Gennari1, Christian Philouze1

  • 1Univ. Grenoble Alpes, CNRS UMR 5250, DCM Grenoble F-38000, France.

Inorganic Chemistry
|May 6, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed novel chromium complexes that achieve C-S bond cleavage for organosulfur removal. This offers a potential alternative to energy-intensive hydrodesulfurization for cleaner fossil fuels.

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Area of Science:

  • Organometallic Chemistry
  • Catalysis
  • Green Chemistry

Background:

  • Cleavage of carbon-sulfur (C-S) bonds is vital for removing organosulfur impurities in fossil fuel refining.
  • The current hydrodesulfurization process is energy-intensive, necessitating alternative methods.

Purpose of the Study:

  • To develop new chromium(III) complexes capable of C-S bond cleavage.
  • To investigate the desulfurization activity of these complexes under mild conditions.
  • To explore the structural diversity and reactivity of chromium-ligand complexes.

Main Methods:

  • Synthesis and characterization of bis-thiolato-ligated chromium(III) complexes.
  • Investigation of complex reactivity under reducing and acidic conditions.
  • Structural analysis of isolated mononuclear and dinuclear complexes.
  • Mechanistic studies to elucidate the desulfurization pathway.

Main Results:

  • Isolation of both 5- and 6-coordinated mononuclear chromium(III) complexes, unlike previously reported 5-coordinated complexes.
  • One complex demonstrated desulfurization of a thiolate ligand under ambient temperature and pressure.
  • Formation of a dinuclear complex and a complex with a partially desulfurized ligand.
  • Experimental evidence supporting a desulfurization mechanism involving H2S release.

Conclusions:

  • Novel bis-thiolato-ligated chromium(III) complexes exhibit C-S bond cleavage capabilities.
  • The developed complexes show potential as alternatives to traditional hydrodesulfurization.
  • The study provides insights into the synthesis, structure, and reactivity of these organometallic complexes.