This work is devoted to the synthesis of a new type adsorbent based on maleic anhydride styrene copolymer (MAST) and N,N`-diphenylguanidine (S) its modification with 4,4'-(ethane-1,2-diylbis(azanylylidene))bis(pentane-2-one) (S+R). Adsorption study Fe (III) ions this has been carried out. Effects pH value, contact time, ionic strength initial concentration metal adsorption capacity product have...

A novel, simple p-dimethyl amino benzyl ethylene diamine reagent has been synthesized under ordinary laboratory conditions and this reagent was successfully applied for the determination of Chromium (VI) in various environmental samples. This reagent yields a red colored complex with chromium metal solution in sodium acetate-acetic acid buffer of pH 7.0. Maximum absorption was obtained at 560 n...

OBJECTIVE Osmotic gradient-induced volume change and sarcolemmal water permeability of cardiac myocytes were evaluated to characterize the mechanism of water flux across the plasma membranes. METHODS Cell surface dimensions were measured from isolated guinea-pig and rat ventricular myocytes by digital videomicroscopy, and membrane hydraulic conductivity (L(p)) was obtained by analyzing the ti...

between the charge distribution of the amide bond and the fluoroalkene moiety, as well as their dipole moments. Therefore, a monofluoroalkene moiety can be used as a peptidomimetic unit in the design of protease inhibitors; this type of rigid isostere of the peptidic bond can facilitate the cis/ trans conformational control of the replaced peptidic fragment. Numerous synthetic endeavors have be...

FIA (flow injection analysis) is a widely used technique for trace element analysis, but has a number of inherent problems. When used to determine the ‘free’ metal concentration, the ‘normal’ reaction time in the manifold, 15–30 s, promotes a significant sequestration of metals from labile and pseudo-labile complexes. Also there is potential for matrix components other than the target analyte t...

Fatemeh Karimi Tabar was born in Asadabad/Hamedan (Iran) in 1986. She completed her B.Sc. in chemistry in 2008 from Bu-Ali Sina University, Hamedan, Iran. She was graduated from M.Sc. degree in organic chemistry from Shiraz University 2010, Shiraz, Iran. She is currently Organic Chemistry Ph.D student under the supervision of prof. M.A. Zolfigol and prof. A. Khazaei in department of chemistry a...

An efficient synthetic strategy for the asymmetric synthesis of a hexahydrodibenzofuran core structure, with a quaternary stereogenic center, emerges by employing a chiral reduction using Corey's (S)-Me-CBS-oxazaborolidine reagent followed by a Mitsunobu reaction to set the stereochemistry. A Pd-mediated intramolecular Heck reaction concludes the tricyclic core structure. Finally, a Pd/C cataly...

A new synthetic approach to 2,3-dihydro-4H-1,3-thiazine derivatives based upon reductive rearrangement of 1,2-dithiole-3-ylidene thiones has been developed. In turn, the 1,2-dithiole derivatives were prepared by an efficient, ring-opening-closing process of 2-alkylidene-4-oxothiazolidines, induced in the presence of Lawesson’s reagent by intramolecular non-bonded 1,5-type S⋅⋅⋅O interactions in ...

Three-electron reduction of hexaazatrinaphthylene (HAN) with a magnesium(I) reagent leads to [(HAN){Mg(nacnac)}3] (1), containing a [HAN](3-) ligand with a spin of S = 1/2. Ab initio calculations reveal that the [HAN](3-) ligand in 1 has a ground-state wave function with multiconfigurational properties, and can be described as a triradicaloid species with a small amount of open-shell doublet ch...

Reduction of oxi me fu nctionality to amine is an important synthetic transformation . As ox imes are stable derivatives of carbonyl compounds, subsequent reduction to amines is an attractive two-step procedure for reductive ami nation . Red uction of oximes to amines can be performed by hydride reducing agents or by catalytic hydrogenation.' Among hydride reducing agents, lithium aluminium hyd...