The acid-catalysed rearrangement of α-free pyrromethanes occurs by fragmentation-recombination, rather than by an intramolecular process, as shown by cross-over experiments.
A. H. Jackson, W. Lertwanawatana, R. K. Pandey and K. R. N. Rao, J. Chem. Soc., Perkin Trans. 1, 1989, 374 DOI: 10.1039/P19890000374
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