Proton resonance spectra of heterocycles. VI. Chromanones, thiochromanones, and 2,3‐dihydro‐4‐quinolones

Abstract

Abstract The nmr spectra of the title compounds and some substituted derivatives are recorded and discussed. It is concluded that 3‐halogeno substituents probably occupy largely pseudo axial positions whereas a 3‐methyl group is predominantly pseudo equatorial.