Nonconventional Liquid Crystals with a Helicene-Containing Core: Synthesis, Columnar Mesomorphism, Photoluminescence, and Electron Conductivity.
Nonconventional mesogens featuring a [5]helicene aromatic core (i.e., 11,20-difluorotribenzo[c,k,m]naphtho[1,2-f]tetraphene, BNAn) were synthesized by two successive BuLi-assisted SNAr reactions in good yields. These tandem reactions involve an initial SNAr reaction between perfluorobenzene (C6F6) and racemic 2,2'-dibr...