... 1), to give the unsaturated azolosubstituted pyr- idines or benzenes. For example, both isomeric pyrido-s- Page 5. Ring Opening Reactions 13 t 3 II li Z -~-Z 88 Monatshefte flit Chemie: Vol. 116/11 Page 6. 1314 N~X A. Petri6 etal.: N--× L )Lj N--X LL .J X Y 17: N CH ...