Abstract
AbstractThe 13C NMR spectra of three aminosulfonic acids (HA) [p‐aminobenzenesulfonic acid (sulfanilic acid), amino‐methanesulfonic acid and 2‐aminoethanesulfonic acid (taurine)] and their anions (A−) and cations (H2A+) were obtained using aqueous H2SO4, fuming H2SO4 and Me2SO solutions of trifluoromethanesulfonic acid. The chemical shifts of HA, A− and H2A+ and the protonation and deprotonation shifts of HA are compared with corresponding data for related amines and sulfonic acids in Me2SO and water. Our results indicate that the three aminosulfonic acids are essentially zwitterionic in Me2SO.
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