N.M.R. Spectral Studies of Some Quinolone Derivatives. Part VII.1Carbon-13 Magnetic Resonance Spectral Studies of N-Methyl-2-Quinolone Derivatives and an Examination ofperiSubstituent Effects

The 13C n.m.r. spectra of a series of 1-methyl-2-quinolone derivatives are presented. The N-CH3 and 8-CH3 carbons each exhibit a characteristic peri deshielding effect. The substituent effects caused by a peri-methyl group have been discussed and compared with effects previously observed in the naphthalene series.