Closed Pentaaza[9]helicene and Hexathia[9]/[5]helicene: Oxidative Fusion Reactions of <i>ortho</i>‐Phenylene‐Bridged Cyclic Hexapyrroles and HexathiophenesFengkun Chen, Atsuhiro Osuka, Takayuki Tanaka et al.|Angewandte Chemie International Edition|2017Cited by 60