1-Chloro-4,6,8-trimethylazulene is formed almost exclusively upon UV irradiation of a deaereted benzene solution of 4-chloromethyl-6,8-dimethylazulene. This photoproduct was identified by 1H and 13C NMR spectroscopy of both the isolated photoproduct and the one prepared by a thermal route. The mechanism proposed involves the recombination of the intimate radical pair initially formed by the photohomolysis
1-Chloro-4,6,8-trimethylazulene几乎完全是在UV辐照4-
氯甲基-6,8-dimethylazulene的脱气苯溶液后形成的。通过分离的光产物和通过热途径制备的光产物的1 H和13 C NMR光谱法鉴定该光产物。提出的机理涉及最初由CCl键的光均溶作用形成的紧密自由基对的
重组,然后发生σ型[1,9]氢位移。