Carbon‐13 NMR spectra of isocoumarin, <i>N</i>‐methyl‐1(2<i>H</i>)‐isoquinolinone and related compounds

Abstract

Abstract The 13 C NMR spectra of isocoumarin, N ‐methyl‐1(2 H )‐isoquinolinone and 14 of their 3‐ and/or 4‐substituted derivatives were measured and assigned with the aid of various spectral techniques. The values of the one‐bond and some of the long‐range 13 C‐ 13 C‐ 1 H coupling constants are reported. The effect of substitution on the 13 C chemical shifts is discussed.