Abstract 13 C‐ and 1 H‐NMR. spectra of ortho ‐benzoquinone 1 and its methyl derivatives have been analysed. By means of heteronuclear double resonance experiments it is shown that assignments given in the literature for the olefinic carbon resonances of 1 and of a series of substituted ortho ‐benzoquinones have to be inverted. 13 C‐carbonyl frequencies of various six‐membered cyclic ketones are presented.
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Hollenstein et al. (1973) studied this question.
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