The Synthesis of Octyl-Substituted Hexathia[7]heterohelicene Based on dithieno[2,3-b:3',2'-d]thiophene via Irradiation

With 2-octyl dithieno[2,3-b:3',2'-d]thiophene as raw material, three steps including formylation, McMurry reaction and photocylization were employed to generate dioctyl-hexathia[7]heterohelicene in total yield of 29.9'. The crystal analysis shows that some short intermolecular interactions including S...S and C...S interactions were observed in the crystal of target compound.