a facile and efficient protocol for the synthesis of 1,8-dioxo-octahydroxanthenes has been developed by one-pot knoevenagel condensation, michael addition and cyclodehydration reaction of dimedone (active methylene carbonyl compound) with aromatic aldehydes in the presence of iron (iii) sulfate hydrate as a solid acidic catalyst under solvent-free conditions. various aromatic aldehydes were uti...

adsorption and desorption behavior of gd(iii) ionon macroporous weak acid resin (mwar) had been investigated.the influence of operational conditions such as contact time, initial concentration of gd(iii) ion, initial ph of solution and temperature on the adsorption of gd(iii) ion had been examined. experimental data were exploited for kinetic and thermodynamic evaluations related to the adsorpt...

electrochemical behavior of the new mono and dinuclear co (iii)  complexes of  the types trans-[pyco((do)(doh)pn )(l)]pf6   and [{py co((do)(doh)pn)}2 (μ-dicyd)] (pf6)2   have been studied in acetonitrile solution.  all the  mono nuclear complexes  show two quasi- reversible reduction couples associate  to co(iii/ii)and  co(ii/i). each of these redox couples split to two  one electron  waves in...

the oxidation of complexes of ti(iii), (til6)3+ (l=ur, meur, dmeur, deture, n-bu-ur, and phur), by iodine as i3- in ethanol and acetonitrile solutions, appears to proceed as a second order reaction and is much faster in ethanol solution (where solvolysis occurs) than in acetonitrile. the enthalpy of activation appears to decrease as ligand's size increases which suggest that the kinetic stabili...

the use of an inorganic phase in water-in-oil (w/o) microemulsion has recently received considerable attention for preparing metal oxide nanoparticles. this is a technique, which allows preparation of ultrafine metal oxide nanoparticles within the size range 40 to 80 nm. preparation of nano chromium (iii) oxide studied investigated in the inverse microemulsion system. therefore the nucleation o...

the aim of the study was to determine the prevalence of metabolic syndrome (mes) in professional bus drivers, and its association with overtime working hours among those drivers in urmia, iran. in this cross sectional study the studies population was 626 professional bus drivers, aged 20-69 yr. the mes (according to thenational cholesterol educationprogram adult treatment panel iii), waist circ...

The synthesis and analytical applications of the new heterocyclic ligand are described. The complexation reaction of the ligand with some cations was studied in aqueous methanol at room temperature using the spectrophotometric method. Results revealed that only the absorption spectra of the Fe (III)–ligand complex show a high redshift of the absorption maximum in the aqueous methanol soluti...

The structure of fungal beauveriolide III, an inhibitor of lipid droplet formation in mouse macrophages, was elucidated to be cyclo-[(3S,4S)-3-hydroxy-4-methyloctanoyl-L-phenylalanyl-L-alanyl- D-allo-isoleucyl] by spectral analyses and chemical degradation.