ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Dissociation constants of D-galacturonic and D-glucuronic acid and their O-methyl derivatives

R. Kohn and P. Kováč

Institute of Chemistry, Slovak Academy of Sciences, 809 33 Bratislava

Abstract:  Dissociation constants (pK, 20°C) of D-galacturonic acid, D-glucuronic acid, their O-methyl derivatives, as well as of the corresponding 4,5-unsaturated substance have been determined by means of discontinuous Potentiometrie titration. The found pK values have been interpreted from the point of view of inductive and mesomeric effects, and nonbonding interactions. It is demonstrated that the effect of the methoxy substitution at various positions of D-galacturonic acid on its acidity has an additive character.

Full paper in Portable Document Format: 324a478.pdf

Chemical Papers 32 (4) 478–485 (1978)