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Intramolecular

Rodriguez1, Navarro, Castedo

  • 1Departamento de Quimica Organica y Unidad Asociada al CSIC, Facultad de Quimica, Universidad de Santiago de Compostela. 15706 Santiago de Compostela, Spain.

Organic Letters
|June 7, 2000
PubMed
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Thermal cycloaddition of 2-propynyldiarylacetylenes yields benzo[b]fluorene derivatives. The tether

Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry
  • Reaction Mechanisms

Background:

  • 2-Propynyldiarylacetylenes are precursors for complex polycyclic aromatic hydrocarbons.
  • Intramolecular cycloaddition reactions offer efficient routes to fused ring systems.

Purpose of the Study:

  • To investigate the thermal intramolecular [4 + 2] cycloaddition of 2-propynyldiarylacetylenes.
  • To elucidate the mechanism and factors influencing the formation of benzo[b]fluorene derivatives.

Main Methods:

  • Thermal reaction of 2-propynyldiarylacetylenes.
  • Theoretical calculations (e.g., DFT).
  • Isotopic labeling studies.

Main Results:

  • Good yields of benzo[b]fluorene derivatives were obtained.

Related Experiment Videos

  • The hybridization of the tether significantly impacts the reaction pathway.
  • A mechanism involving a cyclic allene intermediate was proposed and supported.

    • Conclusions:

    • Thermal intramolecular [4 + 2] cycloaddition is an effective method for synthesizing benzo[b]fluorene derivatives.
    • Reaction outcome is sensitive to the electronic and steric properties of the alkyne tether.
    • The proposed mechanism provides insight into the formation of these polycyclic aromatic systems.