Enthalpies of l-threonine dissolution in some aqueous amides at 298.15 K

The enthalpies of l-threonine dissolution in aqueous formamide, N-methylformamide, N,N-dimethylformamide and N,N-dimethylacetamide were determined by calorimetry at 298.15 K and amide mole fractions up to x2 ∼ 0.3. The standard enthalpies of solution ΔsolH° and transfer ΔtrH° from water to the mixed solvent as well as the enthalpy coefficients of l-threonine–amide pairwise interactions were calculated. The interrelation of the enthalpies of dissolution and transfer for l-threonine with structural features of each of aqueous amides was determined.