Journal of Photosciences

Photochemistry of ¥á, ¥á-Dihalovalerophenones

Volume 11(2004), 75-76 page

ÀúÀÚ: Sungsu Cho and Bong Ser Park

   11-2-75.pdf (36.8K)

Keywords: Yang photocyclization  substituent effects Photochemistry of ¥á  ¥á-Dihalovalerophenones


¥á,¥á-Dibromovalerophenone and ¥á,¥á-dichlorovalerophenone were prepared and their photochemical behaviors were investigated. The former gives C-Br cleavage products and the latter gives mainly the Yang photocyclization products upon irradiation. The reactivity of the chlorine substituted ketone turned out to be quite different from that of ¥á,¥á-difluorovalerophenone which gives both the cyclization and elimination products from the 1,4-biradical intermediate.