U.v. irradiation of pentakis(pentafluoroethyl)pyridine produces the corresponding 1-azabicyclo[2,2,0]hexa-2,5-diene, and hence the 1-azatetracyclo[2,2,0,02,603,5]hexane; these, the first valence-bond isomers of a six-membered-ring heterocycle to be isolated, are stable for several hours at 160°.
M. G. Barlow, J. G. Dingwall and R. N. Haszeldine, J. Chem. Soc. D, 1970, 1580 DOI: 10.1039/C29700001580
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