Valence-bond isomers of heterocyclic compounds: isomers of pentakis(pentafluoroethyl)pyridine
Abstract
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°.