Hydration equilibrium ratios

Quinazoline 3-oxides, hydration equilibrium ratios (table), 65 hydration of, 10, 11, 13, 22 oxidation of, 13 ultraviolet spectra of, 10,11... 

Very few values are known for anhydrous organic bases which can undergo covalent hydration, so that, in general, and for such systems cannot be calculated using Eqs. (12) and (13). However, in cases where the pA of the hydrated species can be measured, Eq. (14) can be used to obtain an approximate estimate of K, the equilibrium ratio of hydrated to anhydrous neutral molecules. This treatment has been applied to quinazoline, the nitroquinazolines, and some triazanaphthalenes. 

Equilibrium Ratios fob Hetebocyclio Acids that Hydrate Reversibly... 

The effects of alkyl substituents in positions 6 and 7 on the rates of hydration and dehydration of 2-hydroxypteridine are not very great. The observed decrease in the equilibrium ratio of [HY]/[HX] has been... 

The first point from this development and example is that, although the quasichemical approach is directed towards treating strong attractive - chemical - interactions at short range, it can describe traditional packing problems accurately. The second point is that this molecular-field idea permits us to go beyond the primitive quality noted above of the primitive quasichemical approximation, and specifically to account approximately for the influence of the outer-shell material on the equilibrium ratios Km required by the general theory. This might help with cases of delicate structures noted above with anion hydrates. 

Equilibrium ratios for the hydrated-anhydrous cationic species of 8-azapurine (6) and its 2-methyl and 2-amino derivatives were similarly determined, and also for the neutral species of 2-amino-8-azapurine and 8-azapurin-2-one, the latter being substantially hydrated as the neutral... 

Mann, S.L., McClure, L.M., Poettmann, F.H., Sloan, E.D., Vapor-Solid Equilibrium Ratios for Structure I and Structure II Natural Gas Hydrates, in Proc. 68th Annual Gas Processing Association Convention, San Antonio, TX, March 13-14 (1989). 

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