Proton magnetic resonance spectra of a scries of ortho ‐dienones have been analyzed using multiple resonance and computer techniques. The sequence of the chemical shifts are in agreement with the calculated π‐electron distribution. The coupling constants of the ring protons are of like sign, whereas those of the methyl protons with the ring protons alternate in sign with the number of intervening bonds.
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Regel et al. (1968) studied this question.
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