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Related Experiment Videos

A novel and highly efficient two-carbon ring expansion.

Georg Rüedi1, Matthias Nagel, Hans-Jürgen Hansen

  • 1Organisch-Chemisches Institut der Universität, 8057 Zürich, Switzerland. georg@access.unizh.ch

Organic Letters
|October 24, 2003
PubMed
Summary

Dynamic gas-phase thermoisomerization of vinylcycloalkanones yields larger unsaturated ketones. This reaction mechanism involves a diradical intermediate and allows for substituent transfer, enabling novel cyclic allene synthesis.

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Area of Science:

  • Organic Chemistry
  • Reaction Mechanisms
  • Synthetic Chemistry

Background:

  • Cycloalkanones are versatile organic compounds.
  • Gas-phase reactions offer unique synthetic pathways.
  • Understanding reaction mechanisms is crucial for chemical synthesis.

Purpose of the Study:

  • To investigate the dynamic gas-phase thermoisomerization (DGPTI) of 3-vinylcycloalkanones.
  • To elucidate the reaction mechanism of DGPTI.
  • To explore the synthesis of ring-expanded ketones and cyclic allenes.

Main Methods:

  • Subjecting medium- and large-ring 3-vinylcycloalkanones to high temperatures (600-630°C).
  • Analyzing reaction products to identify isomeric gamma,delta-unsaturated cycloalkanones.
  • Proposing a reaction mechanism involving diradical intermediates and intramolecular recombination.

Related Experiment Videos

  • Utilizing DGPTI at 540°C for the preparation of cyclic allenes from 3-ethinylcyclododecanone.

    • Main Results:

    • DGPTI of 3-vinylcycloalkanones produces isomeric gamma,delta-unsaturated cycloalkanones with two additional carbon atoms.
    • A mechanism involving an open-chain diradical intermediate followed by intramolecular recombination is proposed.
    • Substituents on the vinyl group are transferred locospecifically to the ring-expanded ketones.
    • Extraordinary cyclic allenes were successfully prepared via DGPTI of 3-ethinylcyclododecanone.

    Conclusions:

    • DGPTI is an effective method for synthesizing ring-expanded unsaturated ketones.
    • The proposed mechanism explains the observed product distribution and substituent transfer.
    • DGPTI provides a novel route to synthesize complex cyclic allenes.