The tautomers (1, X![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
Cl, Br, or I) of anils photocyclise to the phenanthridine derivative (2) with varying efficiencies depending on the halogen and the solvent; owing to the low energies of the first excited states the quantum yields vary with irradiation wavelength.
J. Grimshaw and A. P. de Silva, J. Chem. Soc., Chem. Commun., 1980, 301 DOI: 10.1039/C39800000301
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