31438-22-9Relevant articles and documents
Carbazole N-substituent effect upon DTMA: Stabilizing and photochromic modulating
Huo, Zhiming,Li, Zhipeng,Wang, Tingting,Zeng, Heping
supporting information, 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.
Synthesis and isolation of nitro-β-carbolines obtained by nitration of commercial β-carboline alkaloids
Ponce,Erra-Balsells
, p. 1071 - 1082 (2007/10/03)
Nitration of commercial full aromatic β-carboline alkaloids nor-harmane (1), harmane (2), harmine (3), harmol (4), and the 7-acetylated derivative of harmol (5) is described. Advantages and disadvantages of different nitration reagents which involve acidic conditions (HNO3/H+) and neutral conditions (Cu(NO3)2; ceric ammonium nitrate) are discussed. A complete 1H and 13C-nmr characterization including ms and also uv absorption spectra in neutral and acid media is presented. A detailed ei-ms and ld-tof-ms study is enclosed because the nitro-β-carbolines constitute a new family of β-carboline-like chromophores with potential use as matrix in uv-maldi-tof-ms.
A new method of nitration of carbazoles using ceric ammonium nitrate (CAN)
Chakrabarty,Batabyal
, p. 1 - 10 (2007/10/02)
A convenient procedure for the mononitration of carbazole and 9-alkylcarbazoles using CAN in CH3CN in presence of SiO2 is reported. The results with 9-acetyl, 9-benzoyl and 9- benzenesulphonylcarbazoles are also discussed.