Natural abundance 13C NMR chemical shifts have been experimentally determined for a series of mesoionic thiazolo[3,2‐a]pyrimidine‐5,7‐diones. The spectral data are compared with those of related mesoionic dihydrothiazolo[3,2‐a]pyrimidine‐5,7‐diones and mesoionic 1,3,4‐thiadiazolo[3,2‐a]pyrimidine‐5,7‐diones. Resonable correlation between the observed 13C NMR chemical shifts and CNDO/2 total charge densities have been obtained for the different carbon atoms of 8‐methylthiazolo[3,2‐a]pyrimidine‐5,7‐dione.
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Mbagwu et al. (1983) studied this question.
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