Benzofused dipyrrins react with metal salt copper(II) acetate to predominantly yield a cyclodimer along with a cyclotrimer. N-confused monobenzo-dipyrrin cyclomerized to trioxo-expanded norrole 13a and an acyclic dimer 14 whereas doubly N-confused monobenzo and dibenzo-dipyrrins yielded aza-heptalene 15 and an acyclic dimer 16.

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http://dx.doi.org/10.1039/c5cc10356hDOI Listing

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