Propane thermodynamic behavior

On adding the hydroxyl substituent to the CH2CH2 unit, the barrier for C-C scission is lowered because of more favorable thermodynamics (Albini and Spreti 1987, Barton et al. 1996). However, the hydroxyl substituent becomes effective only after its deprotonation. Cation-radicals of 2-, 3-, and 4-arylalkanols, all of them, undergo C(l)-H deprotonation at pH 4. At pH 10, they display a different behavior. The 2-(4-methoxybenzene)ethanol cation-radical experiences C(2)-C(l) scission, resulting in the formation of formaldehyde and 4-methoxybenzyl radical the 3-(4-methoxybenzene)propanol cation-radical gives rise to 3-(4-methoxybenzene) propanal the 2-(4-methoxybenzene)butanol cation-radical behaves as the C -H acid both in acidic and basic solntions (Baciocchi et al. 1996,1999a). 

The change in appearance of the propane phase as pressure is reduced toward the 2-3 phase boundary is a classical indication of a transition driven by micelle-micelle interactions [14]. The observed 3 configuration would therefore represent a split of the propane phase into a surfactant-rich phase and a surfactant-lean phase, both of which are propane continuous. This interpretation of the pressure-driven phase behavior is supported by the measured phase compositions in the 3 region [22] and also by theoretical modeling of the propane-brine-AOT system using interfacial thermodynamics [43],... 

Several objectives motivated the extension of ACN studies to light compressible solvents [12]. Initial studies of AOT in such solvents had demonstrated the possibility of intriguing solvent effects [20,21,32], which could be clarified by additional experiments. A second objective was to test the concepts generated from the thermodynamic models that were developed for the AOT-brine-propane system [25,44]. A final objective was to study the behavior of nonionic surfactant systems as a complement to AOT systems. Nonionic systems provide an enhanced opportunity to study temperature effects on surfactant phase behavior, as nonionic surfactants are much more responsive to temperature than the anionic surfactant AOT. 

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