Substituent effects and benzene-induced shifts in the proton magnetic resonance spectra of N-(4-methoxybenzylidene)anilines

Abstract

The ¹H n.m.r. spectra of 4-substituted N-(4-methoxybenzylidine)anilines confirm that transmission of electronic effects from the 4- to the α- or 2′-positions is weak. Correlations of chemical shifts and benzene-induced shifts with Hammett substituent constants and with substituent dipole moments have been used as a probe for through-space field effects.