DISQUAC structure-dependent interaction parameters for mixtures containing sec-alkanols and benzene, toluene or n-alkanones

Article Abstract:

Quasichemical (QUAC) interchange coefficients are independent of the size of the alcohol for any organic solvent. Dispersive (DIS) interchange coefficients change with the size of the alcohol. The behavior has been established in various solutions containing alcohol. DISQUAC is good for representing thermodynamic properties of mixtures that include molar excess Gibbs energies, vapor-liquid equilibria and molar excess enthalpies. Mean deviations between experimental and calculated results are about 2% for pressure and 8% for molar excess enthalpies. Mixtures which contain sec-alkanols and n-alkanones, toluene, or benzene have been characterized based on DISQUAC by means of structure-dependent interaction parameters.

Thermodynamics, Chemical structure, Alcohols

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Frondoside C, a new nonholostane triterpene glycoside from the sea cucumber Cucumaria frondosa: structure and cytotoxicity of its desulfated derivative

Article Abstract:

Frondoside C, a nonholostane triterpene glycoside, comes from the sea cucumber Cucumaria frondosa. The structure has been studied through the use of NMR and MS for spectral data. Information was also derived by study of its desulfated derivative obtained by solvolysis. This derivative has intense cytotoxic activity tested in vitro. Sea-cucumber lanostane glycosides lacking the 18(20)-lactone occur rarely. Only six other than the latest one have been found in the literature.

Research, Analysis, Biochemical toxicology, Glycosides, Saponins, Holothurians, Sea cucumbers

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Phenanthroimidazole dimers: structure and free radical reactivity; piezochromism, thermochromism, and photochromism

Article Abstract:

Phenanthroimidazole dimers have been studied for information on structure and free radical reactivity. It was found that they exhibit piezochromism, and thermochromism, but do not show photochromism. The species which are colored are free radicals formed when the dimers dissociate. The dimer-radical equilibrium constants were dependent on substituents on the phenyl ring.

Imidazole, Photochromic materials, Free radical reactions, Thermochromism, Piezoelectric materials

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