REACTION OF PYRYLIUM SALTS WITH NUCLEOPHILES .24. NEW MONO- AND BISPYRIDINIUM SALTS WITH A CENTRAL 2,5-DIARYLOXAZOLE GROUP

摘要

Reduction of nitro substituted 2,5-diaryloxazoles with hydrazine hydrate and Raney nickel affords in good yield 2,5-diaryloxazoles having amino group(s) on the aryl ring(s). The reaction of 2,4,6-tri-substituted pyrylium perchlorates with mono-and diamino-2,5-diaryloxazoles yields new mono- and bispyridinium perchlorates with a central 2,5-diaryloxazole group. Their electronic, C-13 NMR and H-1 NMR spectra are presented and discussed. [References: 30]