Author's Organization：Faculty of Pharmaceutical Sciences, University of Tokyo Faculty of Pharmaceutical Sciences, University of Tokyo Faculty of Pharmaceutical Sciences, University of Tokyo
The ultraviolet, infrared and nuclear magnetic resonance spectra of cycloalkan [b] indolones have been investigated. Steric inhibition of resonance is accompanied by a bathochromic and hypochromic shift in the ultraviolet spectra. It was found that the carbonyl stretching frequency of cycloalkan [b] indolones increased as increasing ring size. The nuclear magnetic resonance spectra also showed ring size effect.
