Polyoxygenated Compounds Research Articles

ChemInform Abstract: Biocatalytic Synthesis of Chiral Polyoxygenated Compounds: Effect of the Solvent on the Enantioselectivity of Lipase Catalyzed Transesterification in Organic Solvents.

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

ChemInform Abstract: Regio‐ and Enantioselective Esterifications of Polyoxygenated Compounds Catalyzed by Lipases.

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Regio- and enantioselective esterifications of polyoxygenated compounds catalyzed by lipases

The lipase catalyzed esterifications of derivatives of propane-1,2,3-triol and butane-1,2,4-triol in organic solvents have been studied. The influence of several factors (lipase source, organic solvent, additives and structural variations in the substrates) on the selectivity have been investigated. Good levels of regio- and enantioselectivity have been achieved, providing practical methods for the synthesis of these chiral building blocks.

ChemInform Abstract: Stereoselective Synthesis Directed Toward Polyoxygenated Compounds: Synthesis of a 3‐Deoxy‐D‐galacto‐nonulosonic Acid (KDN) Equivalent (I).

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Stereoselective Synthesis Directed Toward Polyoxygenated Compounds: Synthesis of a 3-Deoxy-D-galacto-nonulosonic Acid (KDN) Equivalent

Stereoselective Synthesis Directed Toward Polyoxygenated Compounds: Synthesis of a 3-Deoxy-D-<i>galacto</i>-nonulosonic Acid (KDN) Equivalent

Macrocycles polyoxygénés à structure benzodioxinique. Synthèse et étude de la complexation du sodium et du potassium dans le methanol

The synthesis of two new series of polyoxygenated macrocyclic derivatives, 1 and 2, was realised. All these compounds have a 1,4-benzodioxinic moiety and are related to crown ethers, benzocrown ethers, and lariat ethers. The complexing properties of sodium and potassium ions were studied using potentiometry in methanol; results thus obtained are compared to data, previously reported in the literature, for classical polyoxygenated macrocyclic compounds. Keywords: polyoxygenated macrocycles, 1,4-benzodioxin, lariat ethers, sodium and potassium complexes, solvent methanol.

The interaction of some carbohydrate derivatives with sodium ions in acetone solution

The changes induced in the chemical shifts of certain protons in some carbohydrate derivatives and some other poly-oxygenated compounds, on addition of sodium iodide to their solutions in acetone- d 6, are reported. The H-1 resonances of β-glycosides of 2,3- O-isopropylidene-4- O-methyl- L-rhamnopyranoside were significantly affected by the addition of sodium ions, whereas with the α- L-glycosides, these resonances were virtually unaltered. Methoxyacetaldehyde diethyl acetal, triethyl orthoformate, and tris(2-methoxyethyl) orthoformate all showed significant induced-shifts in their acetal-proton resonances on the addition of sodium ions, and all the proton resonances of 1,4-anhydroerythritol were affected, but to differing degrees. With the cis- and trans-5-methoxy-2-phenyl-1,3-dioxanes, it is the former isomer, which can in principle simultaneously use all three oxygen atoms in the molecule to complex a sodium ion, which shows the greatest induced-shift in the acetal-proton resonance.