13C NMR study of ortho‐, meta‐ and para‐alkoxycarbonylalkyloxychalcones and their α,β‐dibrome derivatives

The 13C NMR spectra of eighteen new derivatives of chalcone have been recorded, calculated and fully assigned. The Ai, empirical parameters of the styrylketone, p‐alkoxycarbonylalkyloxystyrylketone and benzoylethylene group were calculated for the prediction of the chemical shifts of substituted benzenes and chalcones.