Figure 6.
13C NMR spectra of the reaction crop of oxazolidin-2-one (red trace), oxazolidine-2-thione (green trace), 1,3-dioxolan-2-one (purple trace), and 1,3-dioxolane-2-thione (black trace).
13C NMR spectra of the reaction crop of oxazolidin-2-one (red trace), oxazolidine-2-thione (green trace), 1,3-dioxolan-2-one (purple trace), and 1,3-dioxolane-2-thione (black trace).