Qualitative and Quantitative Analyses of Naphthalenesulfonic Acids by Sulfur-33 Nuclear Magnetic Resonance Spectroscopy

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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 ¹³C 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.