K. Beresneviciute et al., C-13 NMR-STUDY OF DIHYDROPYRIMIDINEDIONE AND DIHYDROPYRIMIDINE-2-THIONE DERIVATIVES, Magnetic resonance in chemistry, 35(8), 1997, pp. 553-555
The C-13 NMR spectral data for 18 dihydropyrimidinediones and their 2-
thio analogues are presented. The influence of substituents on the shi
elding of neighbouring atoms was analysed and the resonances were unam
biguously assigned. C-13 NMR spectroscopy was shown to be useful for s
tructural determination of dihydropyrimidinediones and thioanalogues a
nd allowed the facile distinction of otherwise similar compounds from
the two classes. (C) 1997 by John Wiley & Sons, Ltd.