Benzannulation Approach to Synthesis of Highly Elaborated Helical Molecules Having 2,3‐Disubstituted Naphthalene Units

Abstract In this study, we classified ortho ‐phenylene‐naphthylene oligomers into three types II , III , and IV based on the sequence of phenylene and naphthylene units. Type II has an alternating sequence of phenylene and naphthylene units, type III has a phenylene‐naphthylene‐phenylene repeating structure, and type IV has a naphthylene‐phenylene‐naphthylene repeating structure. While type II has been studied in detail, there have been few reports on types III and IV . We report on the synthesis and photophysical properties of oligomers with type II , III , and IV substructures. Additionally, X‐ray crystallographic analysis confirmed that these oligomers adopt helical conformations.