An efficient gold-catalyzed amide synthesis from aldehydes and amines in aqueous medium under mild reaction conditions has been developed.

A microporous manganese oxide nanocomposite is synthesized using heteroepitaxy in an aqueous medium at 95 degrees C.

Annulation of internal alkynes with functionalized aryl halides is a versatile and useful method for the synthesis of a wide variety of carboand heterocycles (Fig. 1). To date, many homogeneous transition metal-based catalytic systems have been developed for this transformation. Although homogeneous catalysis have many advantages, difficulties in separation and recovery of the catalyst and prod...

Based on the nitrogenous base or tertiary amine moiety in zolmitriptan (ZMT), an anti-migraine drug, two highly accurate and selective titrimetric methods are proposed for the determination of ZMT in bulk drug and pharmaceuticals. In these methods, the drug dissolved in glacial acetic acid, was titrated with acetous perchloric acid and end point determined either visually by using crystal viole...

A series of heterocycles was synthesized by the reaction of α,β -unsaturated ketones of benzopyrans or coumarins with various nucleophiles in aqueous medium bearing two points of diversity. Compared to an identical library generated by conventional parallel synthesis, a microwaveassisted procedure dramatically decreased reaction times from hours to minutes, and yields of products and intermedia...

Mango stone biocomposite efficiency for the removal of phosphate ions (PO4) from aqueous solution was investigated as a function of pH (2–8), biocomposite dose (0.05–0.40 g/100 mL solution), contact time (5–120 min), initial PO4 ions concentration (20–800 mg/L) and temperature (33–61 C). Maximum PO4 ions removal was achieved at pH 2, biocomposite dose 0.3 g, contact time 90 min and initial PO4 ...

Experimental and theoretical investigations were performed to investigate the effect of water on optical properties of nanoceria as a function of Ce(3+) concentration. Theoretical studies based on density functional plane-wave calculations reveal that the indirect optical transitions in bare ceria nanoparticles are red-shifted with an increase in the concentration of Ce(3+). However, ceria nano...

The photodecomposition of hydrogen peroxide was performed in highly saline aqueous medium (60 g.L of NaCl). The Fe/H2O2/NaCl/UV system was tested at temperatures from 20 to 50 C, while the intervals of concentration of Fe and H2O2 were 1 to 2.5 mM and 230 to 630 mM, respectively. It is known from the literature that chloride is an inhibitor of the oxidation of organic compound in aqueous medium...

The ultrasonic velocity (U), density ( ρ) and viscosity (η) measurements have been carried out for four amino acids namely L-alanine, L-leucine, L-valine and L-proline in aqueous sodium acetate solution as a function of composition at 303, 308 and 313K. Experimental data have been used to estimate the adiabatic compressibility (β), change in adiabatic compressibility (∆β), relative change in ad...

Poly[2]rotaxane and supramolecular assembly have been prepared by modified cyclodextrins bearing an adamantyl group in an aqueous medium.