An Analysis of the Bonding Properties of Benz[<i>a</i>]azulene by X-Ray, NMR, and Computational Studies
作者:Michael Bühl、Wiktor Koźmiński、Anthony Linden、Daniel Nanz、David Sperandio、Hans-Jürgen Hansen
DOI:10.1002/hlca.19960790326
日期:1996.5.8
substructure in 4 by the [a] benzannelation. The alternating bond lengths of 4 and of its parent structure 3 are also reflected in the corresponding variations of the 3J(H,H) and 1J(13C,13C) values of these benz[a]azulenes (cf. Tables 4 and 5). Computations on the MP2/6-31G* level as well as on the BP86/6-31G* level for azulene (6), benz[a]azulene (3), and heptafulvene (7) are in good agreement with the
已经确定了9-苯基苯并[ a ] azulene (4)的X射线晶体结构和相应的未苯甲酸酯化形式的4-苯基苯并氮烯(5)(请参见图2)。在对比5,骨架其示出的几乎相等的C,C键长(参见表1),的七元环4个展品清楚地交替C,C键长(参见表1)。这与在heptafulvene子结构的强烈加重协议4由[一个]苯稠。的交替键长4和其母体结构的3这些苯并[ a ] azulenes的3 J(H,H)和1 J(13 C,13 C)值的相应变化也反映了这些元素(参见表4和表5)。a(6),苯并[ a ] ul(3)和七氟戊烯(7)在MP2 / 6-31G *水平和BP86 / 6-31G *水平上的计算与实验值吻合良好。 (请参阅表6-8)。