Abstract:The 13C NMR spectra of twelve isomeric 2‐and 4‐(E)‐stilbenyloxyalkylthiouracils have been calculated and fully assigned. The Ai and AiK empirical parameters of 4‐ketopyrimidyl‐2‐thioalkoxy, 2‐ketopyrimidyl‐4‐thioalkoxy, 2‐(E) ‐stilbenyloxyalkyl, 2‐(E)‐stilbenyloxyalkylthio, 4‐(E)‐stilbenyloxyalkyl and 4‐(E)‐stilbenyloxyalkylthio groups were calculated for the predictions of the chemical shifts of substituted uracils and benzenes.
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