A di(pyrrolylmethyl)-2H-pyrrole has been synthesised and its ready acid-catalysed rearrangement shows that one of the two possible modes of cleavage is preferred; this mode corresponds to that required for the formation of uroporphyrinogen-III from the putative spiro intermediate.
C. J. Hawker, W. M. Stark and A. R. Battersby, J. Chem. Soc., Chem. Commun., 1987, 1313 DOI: 10.1039/C39870001313
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