Synthesis and properties of [7]helicene and [7]helicene-like compounds with a cyclopenta[1,2-b:4,3-b′]dithiophene or dithieno[2,3-b:3′,2′-d]heterole skeleton

Abstract

A series of [7]helicene and [7]helicene-like compounds composed of a cyclopenta[1,2-b:4,3-b′]dithiophene or dithieno[2,3-b:3′,2′-d]heterole moiety and two naphthalene moieties were successfully synthesized from a common synthetic intermediate, 1,1′-binaphtho[2,1-b]thiophene.