The Acidity Strengths of 3-(4-Aryl) Propionic Acid Derivatives in Amphiprotic and Dipolar Aprotic Solvents

Desiccant efficiency in solvent drying. 3. Dipolar aprotic solvents.

Ionic Equilibria in Protic and in Dipolar Aprotic Solvents

Chemical interactions' as well as 'physical interactions' play an important part in solvation. Some equilibria are reversed on transfer froni protic to dipolar aprotic solvents and this behaviour can be interpreted and predicted through the solvent activity coefficients of the appropriate solutes. Some extrathermodynamic assumptions for the evaluation of single ion solvent activity coefficients...

3-(4-Methoxy­benzo­yl)propionic acid

In the crystal of the title compound, C(11)H(12)O(4), inversion dimers arise from pairs of intermolecular O-H⋯O hydrogen bonds and C-H⋯O bonds further consolidate the packing. There is also a C-H⋯π contact between the benzene ring and the methyl-ene group.

3-(4-Ethoxy­benzo­yl)propionic acid

The title compound, C(12)H(14)O(4), is an important inter-mediate in the synthesis of biologically active heterocyclic compounds. In the crystal structure, inter-molecular O-H⋯O and C-H⋯O hydrogen bonds link the mol-ecules. There are also C-H⋯π contacts between the benzene ring and the methyl-ene groups.

Spectrophotometric determination of the acidity constants of calcon in water and mixed water–organic solvents

The acid–base properties of calcon (1-(2-hydroxy-1-naphthylazo)-2-naphthol-4-sulfonic acid) in water and mixed water–organic solvents at 25 °C at an ionic strength of 0.10 M are studied by a multiwavelength spectrophotometric method. The organic solvents used were the amphiprotic (methanol), dipolar aprotic (dimethylsulfoxide), and low basic aprotic (acetonitrile). To evaluate the pH absorbance...