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High Resolution Image Download MS PowerPoint Slide A one-step synthesis of a nanographene propeller with a D 3 -symmetry was obtained starting from 7,8-dibromo5helicene by Yamamoto nickel(0) couplings. It afforded a chiral polyaromatic hydrocarbon (PAH) embedding six enantiomerically stable 5helicene units. This dense accumulation of helical strain resulted in a distorted geometry, but stable stereochemistry. The conformational, structural, chiroptical, and photophysical properties of the molecule are reported.
Berezhnaia et al. (Tue,) studied this question.