Z-Selective Wittigolefination was applied to the synthesis of large carbazolophanes containing up to eight heteroaromatic subunits. A number of strategies were devised and tested, showing that cyclooligomerization yields can be significantly improved by using one-component schemes involving heterobifunctional reactants. [4]- and [6]Carbazolophanes were characterized in the solid state, revealing compact
Fully Fused Quinoidal/Aromatic Carbazole Macrocycles with Poly-radical Characters
作者:Soumyajit Das、Tun Seng Herng、José L. Zafra、Paula Mayorga Burrezo、Masaaki Kitano、Masatoshi Ishida、Tullimilli Y. Gopalakrishna、Pan Hu、Atsuhiro Osuka、Juan Casado、Jun Ding、David Casanova、Jishan Wu
DOI:10.1021/jacs.6b04539
日期:2016.6.22
While the chemistry of open-shell singlet diradicaloids has been successfully developed in recent years, the synthesis of π-conjugated systems with poly-radical characters (i.e., beyond diradical) in the singlet ground state has been mostly unsuccessful. In this study, we report the synthesis and isolation of two fully fused macrocycles containing four (4MC) and six (6MC) alternatingly arranged quinoidal/aromatic
Expanded azahelicenes consisting of up to 43 rings are accessible by a facilesynthesis. The enantiomers of the acquired azahelicenes exhibited large dissymmetry factors with up to 0.048 (gabs) and 0.021 (glum), respectively.