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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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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
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Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

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The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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Olefin Metathesis Polymerization: Overview01:13

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2.3K
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
2.3K
Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction01:22

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction

2.0K
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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A Customizable Approach for the Enzymatic Production and Purification of Diterpenoid Natural Products
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Modular terpene synthesis enabled by mild electrochemical couplings.

Stephen J Harwood1, Maximilian D Palkowitz1, Cara N Gannett2

  • 1Department of Chemistry, Scripps Research, La Jolla, CA 92037, USA.

Science (New York, N.Y.)
|February 17, 2022
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Summary

Researchers developed an efficient method for synthesizing complex terpenes using nickel-catalyzed electrochemical coupling. This novel approach simplifies terpene preparation, reducing steps and improving scalability for natural product synthesis.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Electrochemistry

Background:

  • Terpene synthesis is a historically significant area of chemical research.
  • Terpene biosynthesis showcases efficient modular design principles.
  • Existing synthetic routes often involve complex functional group manipulations.

Purpose of the Study:

  • To develop a novel, efficient method for synthesizing terpene natural products and polyenes.
  • To leverage modern electrochemical coupling reactions for modular assembly.
  • To minimize synthetic steps and improve scalability.

Main Methods:

  • Utilized nickel-catalyzed electrochemical sp2-sp3 decarboxylative coupling reactions.
  • Employed silver nanoparticle-modified electrodes.
  • Applied spectroscopic and analytical techniques for mechanistic studies.

Main Results:

  • Successfully synthesized 13 complex terpenes and polyenes.
  • Demonstrated a significant step change in synthetic efficiency.
  • Minimized the need for protecting group manipulations and redox fluctuations.
  • Gained in-depth understanding of the functionalized electrode mechanisms.

Conclusions:

  • The developed electrochemical method offers an intuitive and efficient approach to terpene synthesis.
  • This strategy enables the scalable preparation of diverse terpene structures.
  • The findings provide valuable insights into electrode function in catalytic reactions.