Hu Y1, Wang XY1, Peng PX2, Wang XC2, Cao XY2, Feng X3, Müllen K1, Narita A1.
Angew Chem Int Ed Engl. 2016 Dec 14. doi: 10.1002/anie.201610434. [Epub ahead of print]A benzo-fused double carbohelicene (D7H) was synthesized through a regioselective cyclodehydrogenation of a tetranaphthyl-p-terphenyl-based precursor. The twisted (D7H-1) and anti-folded (D7H-2) conformers of D7H were separated by recrystallization, and their double helicene structures with overlapping terminal benzene rings were unambiguously elucidated by X-ray crystallography. A record-high isomerization barrier (46. Read More