Evidence from visible and n.m.r. spectra for the acidity of the C-10 protons in 1,19-dideoxybiladienes-ac is presented. The cyclisation of the 1,19-diunsubstituted 1,19-dieoxybiladienes-ac free bases to corroles is shown to proceed by a free-radical mechanism, and to differ from the mechanism of cyclisation of the corresponding metal complexes.
D. Dolphin, A. W. Johnson, J. Leng and P. V. D. Broek, J. Chem. Soc. C, 1966, 880 DOI: 10.1039/J39660000880
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