Products of the photolyses of the naphthylbenzotriazoles (3) include the red cyclo-octa[def]carbazoles (4), a new ring system formed by unusual cyclisation onto the naphthalene 8a-position; from its 1H n.m.r. spectrum and chemical reactivity, (4) is considered to have antiaromatic paratropic character, associated with the 16π-electron periphery (12), comparable to the isoelectronic fluorenyl anion
                                    所述naphthylbenzotriazoles(的photolyses的产品3)的实例包括红色环辛[ DEF ]
咔唑(4),通过环化异常到
萘8A-位置处形成的新的环体系; 从其1 H nmr光谱和
化学反应性来看,(4)被认为具有抗芳香族亲热特性,与16π电子外围(12)有关,与衍生自(1)的等电子
芴基阴离子相当。