1,720,982 research outputs found
The preparation of beta-hydroxysulfoxides
No full textOxidation of beta-hydroxy thioethers with MnO2-aqu.35%/HCl in methanol gives beta-hydroxy sulfoxides in high yields
CARBONYL REGENERATION FROM PARA-TOLUENSULFONHYLHYDRAZONES BY TRIMETHYLCHLOROSILANE-DIMETHYLSULFOXIDE
No full textTreatment of p-tosylhydrazones of saturated and alpha,beta-unsaturated ketones and aldehydes with trimethylchlorosilane-dimethyl sulphoxide in dry acetonitrile affords the corresponding carbonyl compounds in excellent yields under mild conditions
REGIOSPECIFIC CONVERSION OF ALPHA,BETA-EPOXY ACETATES TO 3-CHLORO-2-HYDROXY ACETATES
No full text3-chloro-2-hydroxy acetates are easily obtained by treating alpha,beta-epoxy acetates with chlorotrimethylsilane-dimethyl sulphoxide in acetonitrile
Synthesis and characterization of new glycosyl-curcuminoids ligands with iron(III) chelating ability
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SULFOXIDES FROM THIOETHERS AND MNO2-HCL
No full textTreatment of thioethers with manganese(IV)oxide-35% aqueous hydrogen chloride in methanol gives sulfoxides in high yields; sulfones are not produce
OXIDATION OF ALPHA-ACETOXY ACETALS WITH TRICHLOROISOCYANURIC ACID
No full textalpha-Acetoxy acid methyl esters are prepared in excellent yields by treating aliphatic alpha-acetoxy dimethyl acetals with trichloroisocyanuric acid in DMF
Hg(II)-coordination by sugar-acids: Role of the hydroxy groups
No full textA solution study on the ability of some derivatised sugars [glucuronic acid (GluA), galacturonic acid (GalA) and glucosaminic acid (GlNA)] to complex the Hg(II) ion is reported. The stability constants of the complex species were determined by potentiometric measurements while H-1 NMR experiments allow to define the coordination sites of sugar molecules. GluA coordinates the metal ion through the carboxylic oxygen and the O-4 hydroxyl group and is found to form more stable complexes with respect to GalA in which metal ligation is from the carboxylic oxygen and the O-5 ring oxygen. GlNA forms stable complexes chelating Hg(II) ion through carboxylic oxygen and the a-amino group. The ternary 2,2 ́-bipyridine containing systems were also investigated by means of potentiometric studies. The ML2 complexes were also isolated in the solid state and characterised by IR spectroscopy
REACTIONS OF THE TRIMETHYLCHLOROSILANE-DIMETHYL SULPHOXIDE REAGENT WITH CARBONYL COMPOUNDS
No full textThe Me3SiCl-Me2SO system is an efficient reagent for the smooth chlorination of unconjugated carbonyl compds. at the more substituted α-carbon atom. β-Dicarbonyl substrates are transformed into α-chloro-α-thiomethyl ether derivs
New water soluble conjugated beta-diketones: potential iron-sequestering agents in treatment of Cooley’s anemia
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