(5S)-Spiro[4.4]nona-3,8-diene-2,7-dione (1) and (5S)-spiro[4.4]nona-2,7-diene-1,6-dione (2) have been prepared; the c.d. of (1) in the longest wavelength π→π* region shows the opposite sign to that predicted by exciton theory as in the case of spiro[4.4]nona-1,6-diene (3).
M. Sumiyoshi, H. Kuritani and K. Shingu, J. Chem. Soc., Chem. Commun., 1977, 812 DOI: 10.1039/C39770000812
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