Strained Dehydrogenative Ring Closure of Phenylcarbazoles
作者:Alexander W. Jones、Marie-Laure Louillat-Habermeyer、Frederic W. Patureau
DOI:10.1002/adsc.201401136
日期:2015.3.23
and strained dehydrogenativeringclosure, for example, in phenylcarbazoles? Since the works of Buchwald and Fagnou, palladium‐catalysed ring‐closing dehydrogenative reactions are legion, but will not operate when the strain at the reductive elimination stage becomes too large. We propose here a “muscled up” super‐oxidative palldium‐catalysed CH activation method for the ringclosure of strained phenylcarbazoles
Thermodynamics and Conformations in the Formation of Excited States and Their Interconversions for Twisted Donor-Substituted Tridurylboranes
作者:Mao Mao、Ming-Guang Ren、Qin-Hua Song
DOI:10.1002/chem.201201719
日期:2012.11.26
state conversion is opposite to the viscosity effect, and temperature effects derive from its resulting changes of polarity and viscosity. For example, the increase of the polarity of the solvent results in excited‐state conversions from the LE state to the ICT state, and/or from the ICT to the TICT state, and an increased viscosity leads to the opposite conversions. On the basis of electrochemical
Photochemical Synthesis of Complex Carbazoles: Evaluation of Electronic Effects in Both UV‐ and Visible‐Light Methods in Continuous Flow
作者:Augusto C. Hernandez‐Perez、Antoine Caron、Shawn K. Collins
DOI:10.1002/chem.201502661
日期:2015.11.9
An evaluation of both a visible‐light‐ and UV‐light‐mediated synthesis of carbazoles from various triarylamines with differing electronic properties under continuous‐flow conditions has been conducted. In general, triarylamines bearing electron‐rich groups tend to produce higher yields than triarylamines possessing electron‐withdrawing groups. The incorporation of nitrogen‐based heterocycles, as well
Substituent effects on electrochemical and electrochromic properties of aromatic polyimides with 4-(carbazol-9-yl)triphenylamine moieties
作者:Hui-Min Wang、Sheng-Huei Hsiao
DOI:10.1002/pola.27103
日期:2014.4.15
Three series of aromaticpolyimides with 4‐(carbazol‐9‐yl)triphenylaminemoieties were prepared from the polycondensation reactions of 4,4′‐diamino‐4″‐(carbazol‐9‐yl) triphenylamine (1), 4,4′‐diamino‐4″‐(3,6‐di‐tert‐butylcarbazol‐9‐yl)triphenylamine (t‐Bu‐1), and 4,4′‐diamino‐4″‐(3,6‐dimethoxycarbazol‐9‐yl)triphenylamine (MeO‐1), respectively, with various commercially available tetracarboxylic dianhydrides
Herein, we describe a facile synthesis of N-arylated carbazoles via ladderization of fluorinated oligophenylenes. The reaction consists of two subsequent nucleophilic substitutions triggered by an electronic transfer from dimsyl anions. The reaction allows the effective one-pot formation of at least six C–N bonds with pronounced selectivity to the C–F bond placement.