Abstract The complete assignments of the 13 C NMR resonances of 1-acetyl-, 1-benzoyl-, 1- benzenesulphonyl-, 1-methanesulphonyl-and 1-(2-nitrobenzenesulphonyl)-isatins and their ring-opened glyoxylic derivatives are reported. The 13 C assignments of acylisatins were derived from isatin as a model, while assignments of glyoxylic derivatives were made by complete assignment of compound 8b together with its use as a model.
