Photochemistry of 2′-halobenzanilides: Reaction mechanism

Ahmed M. Mayouf

Research output: Journal PublicationArticlepeer-review

5 Citations (Scopus)

Abstract

The UV photolysis of acetonitrile solutions of 2′-halobenzanilide were followed by UV-spectroscopy, HPLC and time resolved laser flash photolysis. The chemical yields of the major products produced from the irradiation with medium pressure Hg-lamp were measured. The chemical yields of the photosubstitution product ranged from 3 to 45% (the yield was 3% when the starting material was a solution of 2′-chlorobenzanilide in CH3CN and was 45% when the starting material was a solution of 2′-bromobenzanilide in 10% 1 mol NaOH:CH3CN). The quantum yield measurements of the photoproducts were carried out in N2 and O2 atmosphere in the presence and absence of OH ions. The results showed an enhancement in the yield of the photosubstituted product in the presence of OH ions and in switching from chloro- to bromo-substituent. The presence of O2 lowered the yield of photosubstitution and photoreduction products. Time resolved studies showed two peaks, one appeared at 395 nm and the second centred around 315 nm. These two peaks were identical in both cases of 2′-halobenzanilides (halo = Cl or Br).

Original languageEnglish
Pages (from-to)258-268
Number of pages11
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume172
Issue number3
DOIs
Publication statusPublished - 5 Jun 2005
Externally publishedYes

Keywords

  • 2′-Halobenzanilides
  • Photoreduction
  • Photosubstitution

ASJC Scopus subject areas

  • Chemistry (all)
  • Chemical Engineering (all)
  • Physics and Astronomy (all)

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