نتایج جستجو برای: taft
تعداد نتایج: 465 فیلتر نتایج به سال:
In the past decade, the remarkable potential of ionic-liquid-based aqueous biphasic systems (IL-based ABSs) to extract and purify a large range of valued-added biocompounds has been demonstrated. However, the translation of lab-scale experiments to an industrial scale has been precluded by a poor understanding of the molecular-level mechanisms ruling the separation or partition of target compou...
We report evidence for a strongly geometry-dependent substituent effect. The rate constants for H-D exchange of the R-hydrogens, (kexch)OR, in a set of 19 !-alkoxy sulfones of known, fixed (or strongly preferred) H-CR-C!-OR torsion angles have been measured. Those of corresponding model compounds lacking the alkoxy group, (kexch)model, were also measured, thereby providing the ratio, kN ) (kexc...
The spectral properties of several azulene-oxazolone derivatives containing a phenyloxazolone moiety linked to substituted azulene ring via C=C double bond were studied in different solvents varying polarity. solvatochromism and the ability recognize heavy metal ions investigated. In order estimate contribution non-specific specific solute–solvent interactions, multiple linear regression analys...
The binding energies of 121 complexes between anions and bis(cyclopeptides) differing in the structure number linking units two cyclopeptide rings were analyzed. These Gibbs free obtained earlier work for different anions, under conditions, with methods. multiparametric analysis a subset 42 afforded linear relationships that allowed relatively reliable estimation iodide sulfate affinity three s...
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