SOLUBILITIES OF ORGANOBORON COMPOUNDS IN ORGANIC-SOLVENTS .4. SOLID-LIQUID EQUILIBRIA OF SOME PYRAZABOLES PLUS METHANOL, ETHANOL, 2-PROPANOL OR T-BUTANOL

The solubilities of some pyrazaboles (pyrazabole, 4,4,8,8-tetraethylpy razabole (TEP), and 4,4,8,8-tetrapropylpyrazabole) in alkanols (methan ol, ethanol, 2-propanol and t-butanol) have been determined at tempera tures ranging from the boiling point of the solvent to 273 K. Two corr elation methods were applied: the Wilson and UNIQUAC ASM model. The be st solubility correlation in alcohols was obtained with the UNIQUAC AS M KW equation, with the association constants as an adjustable paramet er. In the calculations, the existence of one solid-solid first-order phase transition of TEP was also taken into consideration. The root-me an-square deviations of the solubility temperatures for all measured d ata varied from 2.9 to 1.9 K for the Wilson and UNIQUAC ASM models, re spectively.