Heterohelicenes with Embedded P-Chiral 1<i>H</i>-Phosphindole or Dibenzophosphole Units: Diastereoselective Photochemical Synthesis and Structural Characterization
dibenzophosphole substituents have been applied to the synthesis of P/N‐bi‐heterosubstituted dimeric helicenes, as well as of new [6]‐ and [8]phosphahelicenes. In these photocyclization processes, the configuration of the stereogenic phosphorus center dictates the sense of helical chirality. Thus, by starting from enantiomerically pure P‐menthylphosphole‐oxide units, this method affords enantiopure helical compounds