π-Expanded triple [5]helicenes bearing dibenzocoronene monoimide subunits.

Two novel π-expanded triple [5]helicenes containing three dibenzocoronene monoimide subunits have been synthesized and characterized. The helicenes exhibit low-energy conformational interconversions, as supported by NMR spectra. The single-crystal X-ray analysis reveals a conformation in the solid state.