Substituent Effects on the 1H N.M.R. Spectra of Substituted Benzamides and N-Alkylbenzamides

The proton chemical shifts (dNHand dCH) of 60 substituted benzamides and N -alkylbenzamides and dCHof seven substituted N,N -dialkylbenzamides have been reported and compared with sub- stituent effects. The chemical shifts (dNH and dCH of H3,5) of N -alkylbenzamides correlate well with Hammett s values. The chemical shift dNH also correlates well with the Taft substituent constant Es. All other chemical shifts are independent of substituent effects.