Irradiation of 1-benzoylindole in enthanol gave mainly 3-benzoylindole and a small amount of indole. 1-o-lodo-benzoylindole in benzene gave a mixture of isoindolo[2,1-a]indol-6-one (II) and indeno[1,2-b]indol-10(5H)-one (III); the latter was also obtained by irradiation by irradiation of 3-o-iodobenzoylindole. Irradiation of 1-o-iodobenzoylindoline gave pyrolo[3,2,1-de]phenanthridin-7-one (I) in small yield.
W. Carruthers and N. Evans, J. Chem. Soc., Perkin Trans. 1, 1974, 1523 DOI: 10.1039/P19740001523
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