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Related Experiment Videos

Ionic photodissociation in arylallyl acetates.

G Venugopal Rao1, M Janaki Ram Reddy, K Srinivas

  • 1Organic Chemistry Division II, Indian Institute of Chemical Technology, Hyderabad.

Photochemistry and Photobiology
|July 20, 2002
PubMed
Summary
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Ionic photodissociation was studied in arylallyl acetates and alcohols. Compounds 1, 2, and 3 efficiently photodissociated in polar solvents, forming rearranged products and undergoing E-Z isomerization.

Area of Science:

  • Photochemistry
  • Organic Chemistry
  • Physical Chemistry

Background:

  • Arylallyl acetates and alcohols are versatile organic compounds.
  • Understanding their photochemical behavior is crucial for synthetic applications.

Purpose of the Study:

  • To investigate the ionic photodissociation of synthesized 3-arylallyl acetates and E-3-(1-naphthyl)-2-propene-1-ol.
  • To elucidate the excited states involved in photodissociation and isomerization processes.

Main Methods:

  • Synthesis of arylallyl acetates (1, 2, 3, 5, 6) and arylallyl alcohol (4).
  • Photochemical studies in polar solvents (acetonitrile, methanol).
  • Analysis of product formation, fluorescence quantum yields, and triplet-sensitization.

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Main Results:

  • Compounds 1, 2, and 3 exhibited efficient ionic photodissociation and E-Z isomerization in polar solvents.
  • Arylallyl alcohol 4 and acetates 5, 6 did not undergo ionic photodissociation.
  • A highly polarized excited singlet state was identified as responsible for ionic photodissociation.
  • Both singlet and triplet excited states facilitated E-Z isomerization.

Conclusions:

  • Ionic photodissociation is solvent-dependent and influenced by the compound's structure.
  • Excited singlet states play a key role in the ionic photodissociation mechanism.
  • Fluorescence and internal conversion are significant deactivation pathways for compounds 5 and 6.