Synthesis of the new pyrido [1, 2??c] benzo??v??triazinium system via valence bond isomerization

A Messmer, G Hajós, J Giber…

Index: Messmer, A.; Hajos, Gy.; Giber, J.; Holly, S. Journal of Heterocyclic Chemistry, 1987 , vol. 24, p. 1133 - 1135

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Citation Number: 5

Abstract

Abstract α-Pyridylphenyl diazonium salts 2 were found to undergo valence bond isomerization and gave the new pyrido [1, 2-c] benzo-v-triazinium salts 3. The ir and nmr studies on the products showed that isomers 2 and 3 form an equilibrium, and the ring closure is favoured by electron withdrawing substituents.