13C NMR spectra of some N-substituted 1,2-dihydro-3,1-benzoxazin-4-ones

The natural abundance ¹³C NMR spectra of a series of hitherto unknown l-atyl-methyl-1,2-dihydro-3,1-benzoxazin-4-ones have been recorded. The assignments of the various resonances have been made from chemical shift arguments, by the analysis of the fine splittings caused by one-bond and long-range couplings and also by comparison with model compounds.