The 1H NMR spectra of 1,6‐dicarbomethoxycyclohepta‐1,3,5‐triene (2) and 3,4‐benzocyclohepta‐1,3,5‐triene (3) have been analysed in terms of chemical shifts and coupling constants. A method for the assignment of δ(AA′) and δ(BB′) in AA′BB′ systems, based on the observation of 13C satellites in the 1H NMR spectrum, is described. For J(1,5) in 3, a negative sign was established. Spin tickling experiments were used to determine the positive sign for J(2,5) in 2 and the negative sign for J(2,7) in 3. The conformation of 3 is discussed.
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Günther et al. (1974) studied this question.
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