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Related Concept Videos

Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview01:27

Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview

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Wilhelm Rudolph Fittig discovered the pinacol coupling reaction in 1859. It is a radical dimerization reaction and involves the reductive coupling of aldehydes or ketones in the presence of hydrocarbon solvent to yield vicinal diols.
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Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction01:22

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The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
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Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

3.2K
Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Catalysis02:50

Catalysis

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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

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4.0K
Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
4.0K

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A Robust Pd-Catalyzed C-S Cross-Coupling Process Enabled by Ball-Milling.

Andrew C Jones1, William I Nicholson1, Harry R Smallman1,2

  • 1Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, U.K.

Organic Letters
|September 17, 2020
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Summary

A new mechanochemical method enables simple carbon-sulfur bond formation using aryl halides and thiols. This catalyst-free reaction proceeds rapidly under ambient conditions, offering a greener alternative for chemical synthesis.

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Area of Science:

  • Organic Chemistry
  • Green Chemistry
  • Materials Science

Background:

  • Carbon-sulfur (C-S) bond formation is crucial in synthesizing pharmaceuticals and organic materials.
  • Traditional C-S coupling methods often require harsh conditions, expensive catalysts, and organic solvents.

Purpose of the Study:

  • To develop an operationally simple and environmentally friendly mechanochemical approach for C-S coupling.
  • To explore the reaction scope and identify key parameters for efficient coupling of aryl halides with thiols.

Main Methods:

  • Mechanochemical synthesis utilizing ball milling under ambient conditions.
  • Screening of reaction parameters including the use of zinc metal as a potential additive.
  • Broad substrate scope evaluation with various aryl halides and thiols.

Main Results:

  • Successful development of a solvent-free mechanochemical C-S coupling reaction.
  • Reaction completion within 3 hours under benchtop conditions.
  • Demonstrated efficacy across a wide range of substrates, with zinc metal proving critical for certain alkyl thiol couplings.

Conclusions:

  • The developed mechanochemical method offers a simplified, efficient, and potentially greener route for C-S bond formation.
  • This approach eliminates the need for solvents, inert atmospheres, and catalyst preactivation.
  • The findings present a valuable alternative for synthesizing sulfur-containing organic compounds.