The intramolecular photocyclization and photoreduction of 2-halo-N-pyridinylbenzamide

Nam Woong Song, Dongho Kim, Yong Tae Park, Chang Hee Jung, Kwang Wook Kim

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The intramolecular photocyclization of aryl halide has been investigated in relation to the synthetic method and the reaction mechanism. It is reported that heterocyclic molecular systems are formed from the photocyclization of haloarene tethered to arene by several linkages and a photohomolytic radical mechanism is involved in the photocyclization of N-phenylalkyl-2-halopyridinium and N-(2-halophenyl)alkyl pyridinium salts. In conjunction with the study of the heterocyclic ring formation, we observed that photoreaction of N-(2-halophenyl)pyridinecarboxamide in a basic medium produced an intramolecular photosubstitution product, 2-pyridinylbenzoxazole, instead of a photocyclization product, whereas photoreaction of 2-chloro-N-pyridinylbenzamide in a weak basic or neutral medium afforded an intramolecular photocyclization product, benzo[c]naphthyridinones. These reactions are straightforward and valuable for the syntheses of heterocyclic compounds such as benzoxazole and benzonaphthyridinone derivatives. Thus, it is desirable to develop the synthetic methods of the heterocyclic compounds and to clarify their reaction mechanisms. In this work, we have studied the photochemical reaction mechanism of 2-halo-N-pyridinylbenzamide by using a nanosecond laser flash photolysis technique.

Original languageEnglish
Title of host publicationCLEO/Pacific Rim 1999 - Pacific Rim Conference on Lasers and Electro-Optics
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages2
ISBN (Electronic)0780356616, 9780780356610
Publication statusPublished - 1999
Event1999 Pacific Rim Conference on Lasers and Electro-Optics, CLEO/Pacific Rim 1999 - Seoul, Korea, Republic of
Duration: 1999 Aug 301999 Sept 3

Publication series

NameCLEO/Pacific Rim 1999 - Pacific Rim Conference on Lasers and Electro-Optics


Other1999 Pacific Rim Conference on Lasers and Electro-Optics, CLEO/Pacific Rim 1999
Country/TerritoryKorea, Republic of

Bibliographical note

Publisher Copyright:
© 1999 IEEE.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Computer Networks and Communications
  • General Physics and Astronomy


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