Thermochimica Acta, Vol.249, 127-142, 1995
Solubilities of Organoboron Compounds in Organic-Solvents .2. Solid-Liquid Equilibria of Some Pyrazaboles Plus N-Alkanols
The solubilities of some pyrazaboles (pyrazabole, 4,4,8,8-tetraethylpyrazabole, and 4,4,8,8-tetrapropylpyrazabole) in n-alkanols (1-butanol, 1-hexanol, 1-octanol, 1-decanol and 1-dodecanol) have been determined at temperatures ranging from the melting point of the solute to 273 K. Two correlation methods were applied : the Wilson and the UNIQUAC ASM [associated-solution model]. The average r.m.s. deviations of the solubility temperatures for all measured data were 1.8 K and 2.0 K for the Wilson and the UNIQUAC ASM model respectively. The best solubility correlation for alcohols was obtained with the UNIQUAC ASM KW equation, with the association constants as an adjustable parameter. In the calculations, the existence of one solid-solid first-order phase transition of 4,4,8,8-tetraethylpyrazabole has also been taken into consideration.