Pschorr-type cyclisations can be effected by dissolving the appropriate solid diazonium tetrafluoroborate in acetone and heating the solution with one equivalent of pyridine, a procedure known to give rise to aryl radical intermediates. Evidence is presented for the intervention of a homolytic mechanism in the copper-catalysed Pschorr ring-closure.
R. A. Abramovitch and A. Robson, J. Chem. Soc. C, 1967, 1101 DOI: 10.1039/J39670001101
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