Spectra and structure of salts of N-methylquinolones

The structures of salts of N-methylquinol-2- and -4-one are considered, using their IR spectra. It is shown that formation of salts from N-methylquinolones is accompanied by protonation of the carbonyl group. The problem of relating the 1500–1700 cm^–1 band in the IR spectrum of N-methylquinol-4-one is considered.