408329-44-2Relevant academic research and scientific papers
Carbazole N-substituent effect upon DTMA: Stabilizing and photochromic modulating
Huo, Zhiming,Li, Zhipeng,Wang, Tingting,Zeng, Heping
, p. 8964 - 8973 (2013/09/23)
Dithienylmaleimide derivatives 7-27 were synthesized by introducing N-substituted carbazole for photo-stabilizing purpose, and the structures were fully confirmed. The photochromism and photo-stability were recorded via UV-vis spectra. Only ortho compounds 8-17 with N-substituents on carbazole moiety showed escalated photochromic change, while compound 7 and the para counterparts 18-27 showed no appreciable photochromism. Additionally, compounds 8-18 exhibited good photo-stability except 17 under 254 nm irradiation. The unstability of 17 may probably due to overrunning hindrance. These photochromic patterns indicated that hindrance and electronic effect mutually paid a decisive influence on the photochromism and photo-stability, which potentially exploited a new way to construct novel photochromic materials with regulable and conceivable performance.
NITRATION IN THE CARBAZOLE SERIES
Kyziol, Janusz B.,Daszkiewicz, Zdzislaw
, p. 1857 - 1862 (2007/10/02)
Nitration of 9-tosylcarbazole in acetic anhydride solution gives 1-nitro (28percent), 2-nitro (19percent) and 3-nitro (53percent) derivatives.The mixture of the nitro compounds obtained from 9-acetylcarbazole contains 10percent, 48percent and 42percent of the isomers, respectively.Under similar conditions 9-nitrosocarbazole shows a different isomer distribution: 34percent of 1-nitro and 66percent of 3-nitrocarbazole.Nitration of carbazole is a two step process involving formation and rarrangement of 9-nitrocarbazole.The hypothesis was supported by the results of 1,3,6,8-tetrachlorocarbazole nitration and oxidation of 9-nitrosocarbazole and rearrengement of 9-nitrocarbazole in the nitration conditions.
