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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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Theory of Strong Electrolytes01:23

Theory of Strong Electrolytes

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The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...
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EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

1.6K
EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
1.6K
Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

6.0K
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.
6.0K
Structure and Nomenclature of Thiols and Sulfides02:17

Structure and Nomenclature of Thiols and Sulfides

6.0K
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,...
6.0K
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

3.9K
Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
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Electrostatically Enhanced Thioureas.

Yang Fan1, Steven R Kass1

  • 1Department of Chemistry, University of Minnesota , 207 Pleasant Street, SE, Minneapolis, Minnesota 55455, United States.

Organic Letters
|January 6, 2016
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Summary
This summary is machine-generated.

Researchers developed novel thiourea catalysts that are significantly more reactive than existing ones for bond-forming reactions. This discovery offers a new approach to activating hydrogen-bond catalysts for broader applications.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Supramolecular Chemistry

Background:

  • Hydrogen-bond catalysis is crucial in organic synthesis.
  • Existing catalysts like Schreiner's thiourea have limitations in reactivity.
  • Developing more potent catalysts is essential for efficient chemical transformations.

Purpose of the Study:

  • To synthesize and characterize a new class of thiourea catalysts.
  • To evaluate the catalytic activity of these novel compounds in bond-forming reactions.
  • To establish a new strategy for activating hydrogen-bond catalysts.

Main Methods:

  • Preparation of thiourea catalysts with positively charged centers.
  • Testing catalyst performance in various bond-forming reactions.
  • Comparative analysis of reactivity against established catalysts.

Main Results:

  • A new class of thiourea catalysts was successfully prepared.
  • These catalysts exhibit significantly higher reactivity (orders of magnitude) compared to Schreiner's thiourea.
  • The catalysts possess positively charged centers and lack additional hydrogen-bonding sites.

Conclusions:

  • The novel thiourea catalysts represent a significant advancement in catalytic efficiency.
  • The findings support a new strategy for enhancing hydrogen-bond catalyst activation.
  • This work opens avenues for more effective catalytic processes in organic synthesis.