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. 2019 Oct 30;10(48):11006–11012. doi: 10.1039/c9sc05087f

Scheme 1. (a) Selective synthesis of triaza-quasi-[8]circulene 12a and triaza[7]helicenes 13a,b. (b) Unexpected formation of triaza-quasi-[8]circulene 12c under mild conditions, and the formation of triaza[7]helicene 13d under the same conditions (PIFA = bis(trifluoroacetoxy)iodobenzene).

Scheme 1