An analysis of the bonding properties of benz[a]azulene by X-ray, NMR, and computational studies

Article abstract of DOI:10.1002/hlca.19960790326

The X-ray crystal structures of 9-phenylbenz[a]azulene (4) and the corresponding non-benzannelated form, 4-phenylazulene (5), have been determined (cf. Fig. 2). In contrast to 5, the skeleton of which shows nearly equal C,C bond lengths (cf Table 1), the