Abstract
Abstract An analysis of the NMR spectra of 2-hydroxyazulene, 2- H -azulenone, 1,2-benzazulene, and the benzene rings of 2,3-benzocycloheptatriene, 3,4-benzotropone, the conjugate acid of 2,3-benzotropone and benzotropenium ion are presented. The NMR vicinal coupling constants indicate that the 7-membered rings of 2- H -azulenone and 1,2-benzazulene exhibit bond length alternation characteristic of polyenes. The vicinal NMR coupling constants of benzene rings fused to additional unsaturated rings reflect the aromatic character of the latter ring.
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