Two bench-stable and readily accessible pyrene-based diaryne precursors based on triflate
as well as TMS triflate motifs are introduced and compared in their [4+2]-Diels–Alder
reactions with tetracyclone to give an oligophenyl-substituted dibenzo[e,l]pyrene in both cases. By single-crystal X-ray analysis, this twistacene showed helical
chirality and an end-to-end contortion of 49.6° due to steric repulsion.
Key words
polycyclic aromatic hydrocarbons - twistacene - Diels–Alder reaction - pyrenes - arynes