Ratio of lyate ions activities in two-components protogenic solvents

Abstract

Kinetic method for the evaluation of Iyate ions activities in two-component protogenic solvents has been discussed. Spectral methods for the measurement of equilibria between alkoxide and hydroxide ions have been compared. A correlation between dissociation constants of water and of weak organic acids in solvent mixtures has been found. By means of this correlation, ratios of Iyate ions activities in water-ethanol and water-2-propanol mixtures have been calculated. These activity ratios, together with the known composition of reaction products, have been used to evaluate the selectivity of the neutral and alkaline solvolysis of phthalic anhydride and benzyl chloride in solvent mixtures quoted above.

Alkoxide-to-hydroxide ion activity ratios in water-ethylene glycol and water-1-propanol systems

“…The data in Table III are somewhat different from those reported previously8; this is due -for the region of w > 50% ethanolto inaccuracy in the calculation of the dissociation constant of water extrapolated to w = 100% ethanol in ref. 8. For the dilute alcohol region, the differences between the data in the two papers illustrate how different data handling procedures and differences in input data affect the final result.…”