New benzopyranocarbazoles: synthesis and photochromic behaviour
作者:M. Manuel Oliveira、Maria A. Salvador、Paulo J. Coelho、Luís M. Carvalho
DOI:10.1016/j.tet.2004.12.055
日期:2005.2
The synthesis of three new benzopyranocarbazoles (=[indole]naphthopyrans) from hydroxybenzo[a]carbazoles is described. The photochromic properties of these novel compounds were investigated under flash photolysis and continuous irradiation. Compared to known [indole]benzopyrans these new compounds showed a significant bathochromic shift in the spectra of the open forms, an increase in colourabilities
描述了由羟基苯并[ a ]咔唑合成三种新的苯并吡喃并咔唑(= [萘]萘并吡喃)。在快速光解和连续照射下研究了这些新型化合物的光致变色性质。与已知的[吲哚]苯并吡喃相比,这些新化合物在开放形式的光谱中显示出显着的红移,显色性增加,并且闭环动力学变慢。化合物4的光致变色行为已经进一步调查。连续的近紫外线照射导致形成一种光异构体(TC),该光异构体随后被部分转化为另一种(TT)。预辐照体系仅部分热转变为原始形式,随后发生单指数衰减,其中包括TC异构体向无色封闭形式(CF)的反向转化。热稳定的TT异构体只能用可见光进行光漂白。已表明该过程通过快速光转换TT→TC,接着是热路径TC→CF进行。还研究了在各种温度下活化系统的热弛豫。
POTENTIAL NITROGEN-HETEROCYCLE CARCINOGENS. VI. POLY-SUBSTITUTED 1,2-BENZOCARBAZOLES, 1,2,5,6- AND 1,2,7,8-DIBENZOCARBAZOLES<sup>1</sup>
作者:NG. PH. BUU-HOÏ、PAUL CAGNIANT、NG. HOÁN、NG. H. KHÔI
DOI:10.1021/jo01151a005
日期:1950.9
Copper-mediated rapid and facile oxidative dehydrogenation of dihydrobenzocarbazoles
作者:Vivek T. Humne、Avinash G. Ulhe
DOI:10.1080/00397911.2020.1731757
日期:2020.4.2
Rapid method for the oxidative dehydrogenation of dihydrobenzocarbazoles has been introduced by using bench scale and commercially available reagent; copper chloride, in excellent yield with easy workup. The scope of the reaction has been studied with broad range of substitutes
Cascade annulative π-extension for the rapid construction of carbazole based polyaromatic hydrocarbons
作者:Samrat Kundu、Ankush Banerjee、Shyam Chand Pal、Meghna Ghosh、Modhu Sudan Maji
DOI:10.1039/d1cc00668a
日期:——
Brønsted acid catalyzed cascade benzannulation strategy for the concise synthesis of benzo[a]carbazoles is reported. Efficacy of the methodology was further validated by synthesizing structurally diverse, extensive π-conjugated carbazole based PAHs.
substitutions on one of the phenyl rings at the sp3 carbon have been synthesized. Their molecular structures were investigated by X-ray and NMR analyses and through quantum chemical calculations. The photochromic mechanism under UV irradiation in toluene, consisting of the consecutive formation of transoid-cis (TC) and transoid-trans (TT) isomers, was studied by UV-vis spectral and kinetic analyses. These