Stable heterocyclic diazonium salts derived from indolizine, quinolizine, and pyrrolothiazole

Abstract

Three indolizine-1-diazonium salts, a cyclopenta[c]quinolizine-3-diazonium salt and two pyrrolothiazole-7-diazonium salts have been synthesised. In each case they were prepared from the corresponding nitroso-compound. These heterocyclic diazonium salts which couple normally with β-naphthoxide ions, prove exceptionally stable both in the solid state and in solution.