QUALITATIVE AND QUANTITATIVE-ANALYSES OF NAPHTHALENESULFONIC ACIDS BY S-33 NUCLEAR-MAGNETIC-RESONANCE SPECTROSCOPY

Sulfur-33 NMR spectra of naphthalenesulfonates have been recorded. Chemical shifts of two kinds of the monosulfonates and two isomers of disulfonates are discussed and compared with C-13 chemical shifts and substituent effects in benzenesulfonates. The first example of the compression effect in sulfur NMR spectra was confirmed in naphthalene-1,5-disulfonate. It has also been shown that the quantitative analyses of these isomers by sulfur-33 NMR were possible with a relative error less than 10% of measurement values.