Acid-base properties and isomerism of nicotinic acid
نویسنده
چکیده
According tó the literature there is ho doubt about the structure of nicotinic acid in mineral acid or alkali hydroxide solutions. However, rather controversial opinions on the structure of the substance can be found in the literature when the state at the isoelectric point is considered. Structure J [1], II [2—4] or an equilibrium mixture [5] have been assigned to nicotinic acid at the isoelectric point on the basis of its u.v. spectral data for aqueous solutions. The present work answers the question on the basis of the comparison of u.v. spectral data and acid-base properties of nicotinic acid and its esters in solvents of different polarity
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