Synthesis and some properties of a new class of six membered heteroaromatic betaines, 3H-pyrido[3,2,1-ij][1,2,4]benzotriazin-4-ylium-3-ides

Abstract

A series of 3H-pyrido[3,2,1-ij][1,2,4]benzotriazin-4-ylium-3-ides has been synthesised by reaction of 8-acylaminoquinolines with O-mesitylenesulphonylhydroxylamine followed by treatment with aqueous alkali. The spectral (u.v., ¹H n.m.r., and ¹³C n.m.r. spectra) and chemical properties (bromination and 1,3-dipolar cycloaddition) of the new mesomeric betaines have been investigated.