This account focuses on the synthesis and structures of symmetric multiple carbohelicenes;
i.e., fully fused polycyclic aromatic hydrocarbons containing two or more symmetric
helicene moieties. Synergies of the multiplexed helicene structures within a π-system
generate a number of local minima and transition states between each state. Based
on recent studies on multiple helicenes, a systematic molecular design for further
multiplexed symmetric helicenes is proposed in the last section of this article.
Key words
nonplanar π-systems - polycyclic aromatic hydrocarbons - helicene - multiple helicene