The energy levels of cycloöctatetraene as D2d and D4d were calculated by the H-L-S-P method. Then we showed that the ground state of C8H8 (D2d and D4d) may be diamagnetic. The resonance energy of C8H8 (D2d and D4d) is about several kilocalories (about ten per cent of that of benzene) from thermochemical data and numerical calculation. The wave length of absorption spectra calculated assuming D2d is in better agreement with the experimental result than that calculated assuming D4d.
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Tanaka et al. (1950) studied this question.
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