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Related Concept Videos

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
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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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Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy
07:36

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Published on: November 9, 2019

Cyclopropenium ion catalysed Beckmann rearrangement.

Vishnu P Srivastava1, Rajesh Patel, Garima

  • 1Department of Chemistry, University of Allahabad-211 002, Allahabad, India.

Chemical Communications (Cambridge, England)
|July 2, 2010
PubMed
Summary
This summary is machine-generated.

A novel cyclopropenium ion catalyst efficiently promotes Beckmann rearrangements of ketoximes to amides and lactams. This organocatalyst offers a new pathway for aromatic cation-based catalysis in organic synthesis.

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Area of Science:

  • Organic Chemistry
  • Catalysis Science

Background:

  • The Beckmann rearrangement is a crucial reaction for synthesizing amides and lactams.
  • Developing efficient and novel catalysts for organic transformations is an ongoing challenge in synthetic chemistry.

Purpose of the Study:

  • To investigate the catalytic potential of 1-Chloro-2,3-diphenylcyclopropenium ion in the Beckmann rearrangement.
  • To establish a new method for the synthesis of amides and lactams using an organocatalyst.

Main Methods:

  • Utilizing 1-Chloro-2,3-diphenylcyclopropenium ion as an organocatalyst at 3 mol% loading.
  • Performing the liquid-phase Beckmann rearrangement of various ketoximes in acetonitrile at reflux temperature for 2 hours.

Main Results:

  • 1-Chloro-2,3-diphenylcyclopropenium ion demonstrated high efficiency as an organocatalyst.
  • The reaction proceeded rapidly, yielding the corresponding amides/lactams within 2 hours.
  • This study marks the first application of cyclopropenium ions in catalysis.

Conclusions:

  • 1-Chloro-2,3-diphenylcyclopropenium ion is a highly effective catalyst for the Beckmann rearrangement.
  • This work introduces a novel catalytic system based on aromatic cations, expanding the scope of cyclopropenium ion applications in synthesis.