Studies on the Proton Magnetic Resonance Spectra in Aromatic Systems, I. Discussions on the Para-disubstituted-, 1-Substituted-3, 4-Dimethoxy- and 1-Substituted-3, 4-Methylenedioxy Benzene Derivatives

Abstract

Proton magnetic resonance spectra of para-disubstituted benzene, 1-substituted-3, 4-dimethoxy- and 1-substituted-3, 4-methylenedioxy benzene series are investigated in the following items : 1. Ring proton chemical shift and Shielding parameter. 2. Ring proton coupling constant and electronegativity of the substituent. 3. Inspection on the analysis of the spectra. 4. Side chain proton shift and Hammett's constant.