Photooxidative cleavage of oxazoline-2-thione in protic and aprotic solvents.

Ionic Equilibria in Protic and in Dipolar Aprotic Solvents

Chemical interactions' as well as 'physical interactions' play an important part in solvation. Some equilibria are reversed on transfer froni protic to dipolar aprotic solvents and this behaviour can be interpreted and predicted through the solvent activity coefficients of the appropriate solutes. Some extrathermodynamic assumptions for the evaluation of single ion solvent activity coefficients...

Isotropic magnetic shielding constants of retinal derivatives in aprotic and protic solvents.

We investigate the nuclear isotropic shielding constants σ((13)C) and σ((17)O) of isomers of retinoic acid and retinal in gas-phase and in chloroform, acetonitrile, methanol, and water solutions via Monte Carlo simulation and quantum mechanics calculations using the GIAO-B3LYP∕6-311++G(2d,2p) approach. Electronic solute polarization effects due to protic and aprotic solvents are included iterat...

Aminolysis of selected methylpyrimidines in protic solvents

Crystallographic data analyses indicate that three types of prolinium cations, along with two types of hydrogen bonding, produce and stabilize the helical structure of triprolinium 12-phosphomolybdate. There are similarities between this organic-inorganic compound and peptides/proteins. The stronger “conventional” hydrogen bonds and the less common C-H…O attractions play critical roles in gener...

Dispersions of Goethite Nanorods in Aprotic Polar Solvents

Colloidal suspensions of anisotropic nanoparticles can spontaneously self-organize in liquid-crystalline phases beyond some concentration threshold. These phases often respond to electric and magnetic fields. At lower concentrations, usual isotropic liquids are observed but they can display very strong Kerr and Cotton-Mouton effects (i.e., field-induced particle orientation). For many examples ...

Desiccant efficiency in solvent drying. 3. Dipolar aprotic solvents.