An efficient and catalytic method for the oxidation of sulfides to sulfoxides using Al(NO3)3.9H2O/SiO2-OSO3H/NaBr/wet SiO2 (50%/w) has been developed.

12-Molybdophosphoric acid catalyzed transfer hydrogenation of nitroarene by hydrazine in a homogeneous phase. This catalytic system was applicable to one-pot quinolines synthesis in the presence of various aldehydes in water. This method provides a new and efficient protocol in terms of mild reaction conditions, clean reaction profiles, small quantity of catalyst, and simple work-up procedure.

2,4,5-triaryl imidazoles were obtained in high yields with excellent purity from the condensation of benzaldehydes, NH4OAc and 1,2-diketone in the presence of a catalytic amount of various heteropolyacids (HPAs).

The task-specific ionic liquid (TSIL) and 1-n-butyl-3-methylimidazolium thiocynanate, ([bmim]SCN) were used as the medium as well as the reactant for the synthesis of a-thiocynanatoketones by the reaction with a-sulfonyloxy aryl ketones. Significant rate enhancements and improved yields have been observed.

Tribromomelamine (TBM) can be used as a novel catalyst for the trimethylsilylation of alcohols and phenols with 1,1,1,3,3,3-hexamethyldisilazane (HMDS). A wide variety of hydroxyl groups were selectively protected in CH2Cl2/CH3CN under mild conditions.

A mesophilic aliphatic ester degrading strain, TH-11, was isolated from environment and further classified as a Streptomyces. When detected using p-nitrophenyl butyrate as substrate, the esterase activity was not affected when the bacteria were removed. Our results suggested that the depolymerase activity were performed by enzymes released into the culture medium.

The authors developed a simple solvothermal route to synthesize PbS nanocrystals in the mild binary mixed solvent made of diethylenetriamine and water. Two kinds of PbS nanostructures (dice-like and cubic) have been successfully prepared at 150°C. The results show that the different forming rate of H2S strongly affect growth rate of crystals, and finally decide the morphologies of PbS.

A novel two-component peak quantitative spectra deconvolution model is employed to elucidate the relationship between the plasmonic properties and the concentration-dependent Au nanocrystals nucleation. The variation of peak area (b/a) shows that the second crystal growth progress, induced the blue-shift phenomenon of surface plasmon absorption, is determined by the initial concentration of starting reagent NaAuCl4.

Fusarium solani biomass was used as biosorbent for Cu(II) and Pb(II) removal. An enhanced Cu(II) removal (96.53%) was observed for aluminum hydroxide pretreated biomass. Maximum Pb(II) removal (95.48%) was observed with native biomass. The kinetic studies showed that the biosorption process followed pseudo second-order model for Cu(II) and Pb(II). The equilibrium data fitted well to the Langmuir isotherm model.

3-Aroyl-2-arylpropionic acids 2a-e were utilized to synthesize 3(2H)-pyridazinones 3a-e and 2(3H)-furanones 6 through reaction with hydrazine hydrate and freshly distilled acetic anhydride, respectively, in the hope of obtaining new 3(2H)-pyridazinones with no ulcerogenic side effect or with negligible general side effects as those currently used NSAIDS as well as biologically active 2(3H)-furanones.

Using the FT-IR spectroscopy, the interactions are revealed for the gel polymer electrolytes (GPEs) of poly(ethylene oxide) (PEO)-NaSCN-propylene carbonate (PC) and PEO-NaSCN-ethylene carbonate (EC). This work quantitatively measures the fraction of PEO amorphous phase, and compares the plasticization of PC and EC in PEO-NaSCN polymer electrolytes with different NaSCN content.

Anhydrides, imides, N-ethylimides, N-hydroxyimides and N-aminoimides of 1,4,5,6-tetramethyl-bicyclo[5.2.1.02,6]hept-5-ene-2,3-dicarboxylic acid, 1,4,5,6,7-pentamethyl-bicyclo [5‥2.1.02,6]hept-5-ene-2,3-dicarboxylic acid and 7-ethyl-1,4,5,6-tetramethyl-bicyclo[5.2.1.02,6]hept-5-ene-2,3-dicarboxylic acid were obtained. Antimicrobial activity of the newly obtained derivatives was tested against selected Gram-positive and Gram-negative bacteria and fungi of the Candida species. The structures of obtained compounds and their antimicrobial activity were compared. Structure of 1b, 2b and 1e were determined by an X-ray analysis.

The objective of this research was to use combustion synthesis to create a nano-sized ZnO photocatalyst using citric acid as the fuel and zinc nitrate as the oxidant. Experimental observations reveal that both UV light and ZnO powders are needed for the photocatalytic reaction and that, in addition, the scattering problem of UV light also needs to be considered. In this work, the optimized photocatalytic degradation ratio reaches 92.7%.

The heats of formation are predicted to be 567.90, 874.29 and 975.83 kJ/mol at the B3LYP/6-31G* level for hexanitrohexazaadamantane (A), nonanitrononaza-tetracyclo[7.3.1.13,7.15,11] pentadecane (B) and tetranitrotetrazacubane (C) respectively. The detonation velocities of the title compounds are larger than, and detonation pressures are much larger than that of the widely used 1,3,5,7-tetranitro-1,3,5,7-tetraazacyclooctane. The dissociation energies for the weakest C-N bonds in the cage skeleton of the title compounds are 137-144 kJ/mol.

A new steroid glycoside derivative, 4′-O-docosanoyl-3-O-β-D-glucosyl-sitosterol, along with six known steroids has been isolated from the ethanol extract of the rhizoma of Acorus calamus L‥ The structures of the new and known compounds were established on the basis of extensive 1D and 2D NMR spectral data.

A series of 1,8-dioxo-decahydroacridine derivatives were synthesized through condensation of aromatic aldehydes, dimedone and aniline catalyzed by Fe3+-montmorillonite. Benzaldehyde and other aromatic aldehydes were employed and reacted well to give the corresponding decahydroacridine in the yields ranging from 80% to 92% over Fe3+-montmorillonite catalyst. Variations of the electronic nature of substituents on the aromatic ring did not show obvious effects in terms of yields.

1-Morpholin-4-yl-5,6,7,8-tetrahydroisoquinoline-4-carbonitrile was synthesized from 3-amino-1-thioxo-5,6,7,8-tetrahydro-1H-isothiochromene-4-carbonitrile and used as starting material to synthesize many thienotetrahydroisoquinolines, which inturn were used in the synthesis of many pyrimido-thienotetrahydroisoquinolines.

N-ester group of naphthalimide disperse dyes caused to increase the dyeing capability while these dyes do not have good heat fastness at high temperatures (> 180 °C). So, we decided to substitute N-ester group with carboxylic group. Thus, in the present study, the synthesis, characterization and dyeing properties of novel monoazo disperse dyes having carboxylic functional group were reported.

Density functional theory (B3LYP) calculations were performed on the Me and F substituted valence isomeric forms of 1-H-boratabenzne. The calculations reveal that planar benzene analog is the lowest energy isomer. The aromaticity of it is analyzed in the light of the nucleus-independent chemical shift (NICS) and shows that aromaticity increase in F substituted, but decrease in Me substituted.

A series of novel pyrazolyl-substituted 1,3,4-thiadiazole derivatives were prepared by cyclization of the intermediate 3-aryl-l-phenyl-pyrazol-4-ylformaldehyde 4′-phenylthiosemicarbazones with 0.5 M ferric chloride solution. The structures of the new compounds were confirmed by IR, 1H NMR and elemental analysis. Simultaneously, the compounds were detected by fluorescence spectrophotometer and had preferable fluorescence activity.

3-Ary-benzoxepines are obtained from phenol by a sequence reaction including O-allylation, claisen rearrangement, O-alkylation, Wittig reaction, and ring-closing metathesis, in 21-26% over-all total yields.

Propargyl alcohol (1) reacted with benzoyl chloride to give propargylphenylcarboxylate (2). Then, the aldehydes (3a-3g) were converted to the related oximes (4a-4g) and nitrileoxides in situ by NaOCl, consequently. Reaction of compound 2 with nitrileoxides in a [3+2] cycloaddition reaction gave regiospecifically isoxazoles (5a-5g). 1H NMR, 13C NMR, FT-IR, and elemental analyses confirmed the structure of the synthesized compounds.

3-(5-{[(1E)-(substituted phenyl) methylene] amino}-1,3,4-oxadiazol-2-yl)-2H-chromen-2-ones (1-18) were synthesized starting from 2-Oxo-2H-chromene-3-carboxylic acid hydrazide in a simple two step process which involves the cyclization of carbohydrazide using cyanogen bromide to oxadiazole. The Schiff bases were then prepared by reacting the later with appropriate substituted benzaldehydes. All the compounds displayed appreciable anticonvulsant activity with less neurotoxicity when tested against the MES induced seizures.

The simultaneous determination of the major triterpenoids in Chaenomeles (Chinese medicinal herb) by high performance liquid chromatography (HPLC) and sample preparation with matrix solid phase dispersion (MSPD) was studied.

The complexation between Cu(II) and of azocarmine B was characterized by the spectral correction method and used for determination of Cu(II) by the light-absorption ratio variation approach combined with continuous flow analysis. The limit of detection of Cu(II) is 0.04 mg/L, the recovery is between 97 and 100% and about 30 samples could be analyzed per hour by CFA.

The ionophore bis-salicyladehyde-diaminjodipropylamine (BSDDA) was synthesized by the reaction of salicyladehyde with diaminjodipropylamine in a 2:1 molar ratio in ethanol. The O and N atoms in ionophore are in favor of the coordination between the ionophore and metal ions. The experimental results demonstrated that the ionophore exhibited excellent potentiometric response characteristics for Hg2+ ion, in addition, the electrode can be used to the detection of Hg2+ ion in the sample.

One phenformin hydrochloride molecule and three sodium nitroprusside(SNP) molecules can take place nucleophilic substitution reaction in basic solution. The formed product has maximal absorption wavelength at 520nm. Phenformin hydrochloride and SNP almost have no absorption in the range of 500nm − 900nm. According to the absorbance of product, the amount of phenformin hydrochloride can be obtained.

A spectrophotometric method for the quantitative analysis of nicorandil is developed based on the reaction of drug with NH4Cl and Zn dust resulting in the formation of nitrite ion, which reacts with KI and starch in dilute HCl medium to form a blue product peaking at 550 nm.

A convenient method for the synthesis of quinoxalines catalysed by metal hydrogen sulfates by the reaction of 1,2-diamino compounds and 1,2-dicarbonyl compounds in ethanol as solvent at room temperature reported.