Solubilities of Oleanolic Acid and Ursolic Acid in Different Organic Solvents and 2-Propanol + Water Binary Solvent Mixtures at Different Temperatures: Experimental Measurement and Modeling

2020 ◽  
Author(s):  
Jie-Ping Fan ◽  
Xiao-Hui Lai ◽  
Xin Tian ◽  
Xue-Hong Zhang ◽  
Ya-Hui Cao ◽  
...  
Keyword(s):  
Organic Solvents ◽  
Ursolic Acid ◽  
Oleanolic Acid ◽  
Experimental Measurement ◽  
Binary Solvent ◽  
Solvent Mixtures ◽  
Binary Solvent Mixtures ◽  
Different Temperatures

Empirical Parameters of Lewis Basicity of Binary Solvent Mixtures, Part II Mixtures with Water

1989 ◽  
Vol 44 (6) ◽  
pp. 673-678 ◽  
Author(s):  
Piotr K. Wrona ◽  
Tadeusz M. Krygowski ◽  
Urszula Zielkowska
Keyword(s):  
Organic Solvents ◽  
Probe Molecule ◽  
Binary Solvent ◽  
Solvent Mixtures ◽  
Binary Solvent Mixtures ◽  
Solvent Water

The Kamlet and Taft basicity parameters βKT, for twelve mixtures of organic solvents with water are reported. Also the data for water-butanols (n-BuOH. i-BuOH. and s-BuOH) and alcohols (MeOH, EtOH. n-PrOH. and i-PrOH)-n-hexane mixtures are given. It was found that in the case of mixtures of 1.4-dioxane. acetone, tetrahydrofuran. dimethylsulfoxide. and acetonitrile with water, the basicity parameters of the mixture are higher than that of pure solvents in a region of smaller concentrations of water.These results, together with earlier reported results for THF and Et2O mixtures with MeOH are discussed in terms of breaking off the structure of the more structurized solvent (water and MeOH). All these mixtures, except the W-THF mixture, show the excess thermodynamic func­tions (ΔHE and ΔSh) analogous to MeOH-CCl4 mixtures, where depolymerization of MeOH clusters was postulated.Relativity of different basicity scales in respect to the acidic probe molecule is also shortly discussed

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