Aug. 1981 Synthesis of Pyridinium Heterocyclic Ylides. Degradation of the Pyridinium Group Marta E. Esteve and Carlos H. Gaozza Departamento de Quimica Orginica, Facultad de Farmacia y Bioquimica, Universidad de Buenos Aires, Argentina Received December 15, 1980 ... The synthesis of pyridinium-quinolone chlorides and ylides, a pyridinium-methylquinazolone ylide, 9-pyridinium acridine chloride, and their behaviour by treatment with boiling aniline ...