N-Ethoxycarbonyl Dewar pyrrole 9, the first member of the parent ring, is formed via photofragmentation of 6 at –60 °C and trapped as its adduct with 1,3-diphenyl-isobenzofuran 11; above this temperature, 9 is unstable and isomerises to N-ethoxycarbonylpyrrole 10.
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