Synthesis and Electronic Spectroscopy of Bromocarbazoles. Direct Bromination ofN- andC-Substituted Carbazoles byN-Bromosuccinimide or aN-Bromosuccinimide/Silica Gel System
作者:María B. Ponce、Franco M. Cabrerizo、Sergio M. Bonesi、Rosa Erra-Balsells
DOI:10.1002/hlca.200690110
日期:2006.6
The preparation, isolation and characterization by elemental analysis and 1H-NMR, 13C-NMR, and MS data of the bromo derivatives of N-substituted carbazoles, i.e., of 9-methyl-9H-carbazole (1), 9-phenyl-9H-carbazole (2), 9-benzyl-9H-carbazole (3), 2-methoxy-9-methyl-9H-carbazole (4), and of C-substituted carbazoles, i.e., of 2-(acetyloxy)-9H-carbazole (5) and 3-nitro-9H-carbazole (6), are reported,
N-取代咔唑的溴代衍生物,即9-甲基-9 H-咔唑(1),9-的元素分析和1 H-NMR,13 C-NMR和MS数据的制备,分离和表征苯基-9 H-咔唑(2),9-苄基9 H-咔唑(3),2-甲氧基-9-甲基-9 H-咔唑(4)和C-取代咔唑即2-的(乙酰氧基)-9 H-咔唑(5)和3-硝基-9 H-咔唑(6),部分为首次报告。作为溴化试剂,Ñ溴代琥珀酰亚胺(NBS)或NBS /在CH硅胶2氯2,NBS在AcOH,溴酸钾3 / KBr压在EtOH掺杂有H的催化量的2 SO 4,或溴酸钾3 / KBr压在AcOH是雇用,并对其用途进行了比较。进行了半经验的PM3计算,以预测N取代基和C的反应性取代咔唑及其溴代衍生物,并证实了实验结果。紫外线吸收和在298K的MeCN溶液中和在77K的固体基质的溴代咔唑衍生物的荧光和磷光发射光谱与相应的咔唑进行比较1 - 6。最低激发单重态和三重态的动态特性(τ