The eight-membered rings (ArC)2N4(SPh)2[Ar = 4-XC6H4(X = Br, CF3)] undergo photoisomerization to the purple diazenes PhSN![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
C(Ar)NNC(Ar)NSPh by a first-order process that is thermally smmetry-forbidden, but photochemically allowed.
T. Chivers, I. Vargas-Baca, T. Ziegler and P. Zoricak, Chem. Commun., 1996, 949 DOI: 10.1039/CC9960000949
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