Now showing items 1-10 of 19
Enantioselective addition of diethyl zinc to benzaldehyde catalyzed by Ti(IV) and glucose derivatives
(Sociedad Chilena de Quimica, 2010)
D-Glucose derivatives 1,2:5,6-di-O-isopropyline-a-D-glucofuranose (1) and 1,2-O-isopropyline-a-D-glucofuranose (2) with Ti(IV) are chiral catalysts in the addition of diethylzinc to benzaldehyde. The Ti(IV)-carbohydrate ...
ENANTIOSELECTIVE ADDITION OF DIETHYL ZINC TO BENZALDEHYDE CATALYZED BY TI(IV) AND GLUCOSE DERIVATIVES
(Sociedad Chilena de Química, 2010)
Separation of the toxic zierin from Zollernia ilicifolia by high speed countercurrent chromatography
Preliminary pharmacological assays of the 70% methanol extract from the leaves of the Brazilian medicinal plant Zollernia ilicifolia Vog. (Fabaceae) showed analgesic and antiulcerogenic effects. Previous analyses have shown ...
Solvent effect on the sensitized photooxygenation of 2,3-dihydropyrazine derivatives
(AMER CHEMICAL SOC, 2003-04-18)
Detection Of O-2((1)Delta(g),) phosphorescence emission, lambda(max) = 1270 nm, following laser excitation and steady-state methods was employed to determine the total rate constant, k(T), and the chemical reaction rate ...
Enantioselective Addition of Diethylzinc to Benzaldehyde Catalyzed by an Organometallic Ti(IV) Compound and a Xylose Derivative
(SOC BRASILEIRA QUIMICA, 2009)
A derivative of D-xylose, 1,2-O-isopropylidene-alpha-D-xylofuranose (1), with Ti((OPr)-Pr-i)(4) was used as a chiral catalyst in the asymmetric alkylation of benzaldehyde with diethylzinc (Et2Zn) for the high-yield production ...
Synthesis and characterization of ruthenium (II) carbonyl complexes containing naphthyridine and acetylacetonate ligands and their catalytic activity in the hydrogen transfer reaction
A series of novel complexes of the Ru(L)2(CO)2 L = 2-(3′ methoxyphenyl)-1,8-naphthyridine (complex 1), and type Ru(acac)2(L)(CO) with L = 2-(3′ methoxyphenyl)-1,8-naphthyridine (complex 2), 2-(2′- bromophenyl)-1,8-naphthyridine ...
Lignin from sugar cane bagasse: Extraction, fabrication of nanostructured films, and application
(Amer Chemical Soc, 2007-06-05)
Four lignin samples were extracted from sugar cane bagasse using four different alcohols (methanol, ethanol, n-propanol, and 1-butanol) via the organosolv-CO2 supercritical pulping process. Langmuir films were characterized ...