Figure 1.
(a) BN-doped [6]helicenes with boron atoms in the outer rims; (b) NBN-doped helicenes based on aza[7]helicene with boron atoms connected to the outer rims; (c, d) NBN-doped helicenes with boron atoms in the inner rims in this work via one-pot borylation with a fold-in or pan-out manner.