Synthesis, Properties and Applications of BICAP: a New Family of Carbazole-Based Diphosphine Ligands
作者:Peter N. M. Botman、Jan Fraanje、Kees Goubitz、René Peschar、Jan W. Verhoeven、Jan H. van Maarseveen、Henk Hiemstra
DOI:10.1002/adsc.200303241
日期:2004.6
A newfamily of bidentate phosphine ligands based on the biscarbazole backbone has been synthesized and applied in the ruthenium- and rhodium-catalyzed asymmetric hydrogenations of methyl acetoacetate and dimethyl itaconate. The nitrogen atoms in these BICAP ligands allow facile introduction of substituents providing structurally similar, but electronically different ligands, which were used to fine-tune
design of circularlypolarized and thermallyactivateddelayedfluorescence (CP-TADF) materials based on a chiralluminescent exciplex strategy is explored based on a chiral donor and different achiral acceptor units. This approach leads to CP-TADF properties with glum up to 7×10−3 and straightforward color tuning by playing with the energy level of the achiral acceptor while keeping the same chiral donor
Axially and Helically Chiral Cationic Radical Bicarbazoles: SOMO–HOMO Level Inversion and Chirality Impact on the Stability of Mono- and Diradical Cations
We report persistent chiral organic mono- and diradical cations based on bicarbazole molecular design with an unprecedented stability dependence on the type of chirality, namely, axial versus helical. An unusual chemical stability was observed for sterically unprotected axial bicarbazole radical in comparison with monocarbazole and helical bicarbazole ones. Such results were experimentally and theoretically
Introduction of axial chirality in a planar aromatic ligand results in chiral recognition with DNA
作者:Marc-André Dubois、Alain Grandbois、Shawn K. Collins、Andreea R. Schmitzer
DOI:10.1002/jmr.1055
日期:2011.3
Dimerization of a hydroxycarbazole produces an axiallychiral biaryl, BICOL (2). One enantiomer (R)-2, is capable of enantioselective binding to different polymorphs of DNA. The biaryl (R)-2 was shown by fluorescence and circular dichroism to induce a shift of Z-DNA to B-DNA. The opposite enantiomer (S)-2 shows no specific binding. The significant difference in behaviour between the two enantiomers
The synthesis and resolution of a novel chiral C-2-symmetric bicarbazolediol (BICOL), is reported. The key step in the synthesis is the copper(II)-catalysed oxidative phenol coupling of 3-hydroxycarbazole. Menthyl chloroformate is used as resolving agent for the separation of the two enantiomers of BICOL.