Proton magnetic resonance spectra of some naphthalene derivatives in DMSO-d 6

Abstract

The chemical shifts of the ring protons of 14 naphthalenesulfonic acid derivatives have been assigned from 250 MHz spectra. In addition, the spectra of a large number of monosubstituted naphthalenes were recorded using DMSO-d 6 as solvent. It is clear from this latter part of the study that DMSO-d 6 often causes an upfield (to a lower δ value) shift (relative to those in CDCl 3) in the δ values of the protons in this ring system. It is also clear that a number of signals are less resolved when DMSO-d 6 is used in lieu of CDCl 3, at the field strength of 250MHz.