𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Factor analysis applied to the study of the effects of solvent composition and nature of the inert electrolyte on the protonation constants in dioxane—water mixtures

✍ Scribed by E. Casassas; N. Domínguez; G. Fonrodona; A. de Juan

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
900 KB
Volume
283
Category
Article
ISSN
0003-2670

No coin nor oath required. For personal study only.

✦ Synopsis

The effect of solvent properties on protonation constants was studied for water-dioxane mixtures covering a wide range of solvent compositions, from data sets on several solutes with a variety of functional groups. The establishment of the model was carried out using different approaches: the use of a classical procedure, where the best multiparametric fit to the Kamlet and Taft equation was evaluated for each substance; and the application of combined factor analysis and target factor analysis to quantify and identify the factors affecting the variation of the whole data sets, without the need to postulate any a priori hypothetical model. Further, a preliminary overview of the influence of different inert electrolytes on the values of the solute protonation constants in this solvent mixture was also obtained through factor analysis.

📜 SIMILAR VOLUMES

Studies on the Protonation Constants and
Studies on the Protonation Constants and Solvation of α-Amino Acids in Dioxan–Water Mixtures
✍ Fitnat Köseoglu; Esma Kiliç; Alev Dogan 📂 Article 📅 2000 🏛 Elsevier Science 🌐 English ⚖ 53 KB

To gain more information about the effect of solvent on ␣-amino acids, the stoichiometric protonation constants of 10 ␣-amino acids (glycine, DL-alanine, DL-valine, L-leucine, L-isoleucine, DL-phenylalanine, Lserine, L-threonine, L-asparagine, and L-glutamine) in different dioxan-water mixtures have

Reactions of aryl acetates with secondar
Reactions of aryl acetates with secondary alicyclic amines in ethanol/water mixtures: Effect of the solvent composition on the kinetics and mechanism
✍ Enrique A. Castro; Daniela Millan; Raul Aguayo; Paola R. Campodónico; José G. Sa 📂 Article 📅 2011 🏛 John Wiley and Sons 🌐 English ⚖ 161 KB

## Abstract We report a kinetic study on the reactions of secondary alicyclic amines toward 4‐nitrophenyl, 2,4‐dinitrophenyl, and 2,4,6‐trinitrophenyl acetates (**1, 2**, and **3**) in ethanol/water mixtures of different compositions. It is found that (i) the intermediate in the reaction of **1** i

Effects of solvent medium on solubility.
Effects of solvent medium on solubility. V: Enthalpic and entropic contributions to the free energy changes of Di-substituted benzene derivatives in ethanol: Water and ethanol: Cyclohexane mixtures
✍ Ruben H. Manzo; Amelia A. Ahumada 📂 Article 📅 1990 🏛 John Wiley and Sons 🌐 English ⚖ 570 KB

The solubility at four different temperatures in water, cyclohexane, and mixtures of water and ethanol and ethanol and cyclohexane of nine derivatives of the structure pX1-C6H4-X2, together with their heats of fusion are reported. The enthalpy and entropy of mixing (delta HM and delta SM, respective

Helix-coil stability constants for the n
Helix-coil stability constants for the naturally occurring amino acids in water. XIII. The presence of by-products in amino-acid analysis of copolymers and their effect on the guest parameters; recomputed values of σ and s for L-serine
✍ J. W. Van Nispen; D. J. Hill; H. A. Scheraga 📂 Article 📅 1977 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 315 KB 👁 2 views

## Abstract Previously used procedures for processing the amino acids from 6__N__ hydrochloric acid hydrolysis of poly[__N__^5^‐(4‐hydroxybutyl)‐L‐glutamine], poly[__N__^5^‐(3‐hydroxypropyl)‐L‐glutamine], and several random copolymers derived from these, led to the formation of spurious products. T