H-1 AND C-13 NMR-STUDY OF SOME (E)-3'-AND 4'-SUBSTITUTED STILBEN-4-OLS

A series of ten (E)-stilben-4-ols, HOPhCH = CHPhX, with X = H, 4'-Cl, 4'-F, 4'-Me, 4'-OMe, 3'-Me, 3'-OMe, 3'-OH, 3'-F and 3',4-diOMe, were studied using one- and two-dimensional NMR techniques. Interpretation of these spectra led to definitive assignments of all carbon and hydrogen chemical shifts. H-1 chemical shift increments were quantitatively determined for the five substituents studied, and the para A(i) value of the styryl group was found to be more deshielding than those recorded in previous reports.