title: Efficient synthesis of benzo fused tetrathia[7]helicenes.
abstract: An efficient route toward the synthesis of symmetrical and unsymmetrical benzo fused tetrathia[7]helicenes substituted with electron donor (ED) and electron acceptor (EA) groups is reported. A common, readily available precursor 1,2- bis-(2-thienyl)benzene was used to synthesize different helicenes through a Wittig reaction, Stille coupling, and modified oxidative photocyclization.
authors.affiliation: Molecular Design and Synthesis, Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium.
authors.forename: Deepali
authors.initials: D
authors.lastname: Waghray
authors.forename: Wienand
authors.initials: W
authors.lastname: Nulens
authors.forename: Wim
authors.initials: W
authors.lastname: Dehaen