Photobis-cyclisation of 1,2,6-triarylpyridinium cations gives 10b-azadibenzo[fg,op]naphthacenium cations (3a–e) and their 2-aza-analogues (3f–c); the structures are supported by X-ray crystallographic analysis of 9-phenyl compound (3f).
A. R. Katritzky, Z. Zakaria, E. Lunt, P. G. Jones and O. Kennard, J. Chem. Soc., Chem. Commun., 1979, 268 DOI: 10.1039/C39790000268
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