Compounds of the formula M2NiF6 containing tetravalent nickel and the three heavy alkali metals were prepared and their electronic spectra studied. The observed peaks were assigned to the crystal-field energy levels for an octahedral low-spin d6 configuration. The crystal-field parameters for K2...

Fluorinations of benzene over potassium hexafluoronickelate(IV) at temperatures of 120-350° have given mixtures of fluorocyclohexanes containing small amounts of fluorocyclohexenes and fluorobenzenes. Benzene was recovered unchanged after contact with potassium trifluoronickelate(II) at elevate...

Catalytic oxidation of CC bond is a key technology to transform petroleum-based as well as sustainable biomass feedstock into more valuable oxygenates. We herein describe a convenient and useful oxidation strategy of converting ketones into carboxylic acids using homogeneous copper catalyst with...

SummaryAn operationally simple organo-Brønsted-acid-catalyzed asymmetric and regioselective “dial up and lock in” of one or more stable isotopes into organic compounds is unknown. Here, we describe a newly designed, chemically versatile protocol mediating single- or multiple-isotope incorporat...

The wide occurrence of sunscreen agent micropollutants in natural environment received extensive attention in recent years due to their potential endocrine disrupting effect. The present study focuses on the kinetics and mechanism of photocatalytic degradation of sunscreen agent 2-phenylbenzimid...

An international collaborative study of isotopic methods applied to control the authenticity of vinegar was organized in order to support the recognition of these procedures as official methods. The determination of the 2H/1H ratio of the methyl site of acetic acid by SNIF–NMR (site-specific na...

Astragalus membranaceus polysaccharide-iron (III) complex (APS-iron) was synthesized and characterized. Based on single factor and response surface optimization experiments of APS-iron (III) complex synthesis, the optimum conditions of APS-iron (III) complex were obtained as follows: the reactio...

Glucose electrodes based on hydrogels made by crosslinking glucose oxidase and the redox polymer formed upon complexing polyvinyl imidazole (PVI) with [Os(dmo-bpy)2Cl]+/2+ (dmo-bpy= 4,4′-dimethoxy-2,2′-bipyridine) on vitreous carbon electrode surfaces were investigated. The redox potential of ...

The crystal study of tris(4,4′-dimethoxy-2,2′-bipyridine)iron(II)bis(hexafluorophosphate) (crystal solvate with N-methyl-2-pyrrolidone) was performed at 295 K. The crystals are triclinic, a = 11.721(4), b = 12.864(6), c =15.664(7) Å, α = 77.14(4),β = 85.03 (3), γ = 81.76(3)°, space group ...

Two adducts of the N,N′-bidentate aromatic base 4,4′-dimethoxy-2,2′-bipyridine (4,4′-dmo-2,2′-bpy) of lead(II) salts, [Pb1.5(4,4′-dmo-2,2′-bpy)Br3]n (1) and [Pb(4,4′-dmo-2,2′-bpy)I2]n (2), have been synthesized and characterized by elemental analysis, IR, 1H-NMR spectroscopy and studied...

A new organocatalytic approach for the synthesis of peroxides based on СН activation of a sp3-hybridized carbon atom is reported. Peroxides were prepared in 31–89% yield by the reaction of malonates, β-ketoesters, and cyanoacetic esters with a Bu4NI/tert-butyl hydroperoxide system. The forma...

A limited series of β-benzeneethanamines (I) was synthesized and evaluated to determine their antiinflammatory activity, and their ability to inhibit rat polymorphonuclear cell phospholipase-A2, ovine seminal vesicle prostaglandin synthetase, and rat basophilic leukemia cell 5-lipoxygenase.

The reaction of 3-(1-bromobenzyl)coumarin 3 with trialkyl phosphites afforded in good yields the corresponding dialkyl phosphonates 5, the Arbuzov reaction products. The interaction of trialkyl phosphites with 3-(ω-bromoacetyl)coumarin 4 gave the corresponding dialkyl vinylphosphates 8 as the o...

Two organophosphorus pesticides, fenthion and temephos were oxidized with N-bromosuccinimide (NBS) in order to obtain the oxidated analogues which are the activated form of the pesticides. Analysis of the non-oxidized solution containing the pesticides, and two oxidized solutions which differed ...

Temephos is an organophosphorus pesticide that is used in control campaigns against Aedes aegypti mosquitoes, which transmit dengue. In spite of the widespread use of temephos, few studies have examined its genotoxic potential. The aim of this study was to evaluate the cytotoxic, cytostatic and ...

Novel cationic surfactants having two hydrophobic groups and two quaternary ammonium ions which are in the middle of alkyl group were prepared by two-step reactions. Three kinds of N,N-bis-(3-n-alkoxy-2-hydroxypropyl)-N,N-dimethyl-1,3-propylenediamine were prepared quantitatively as the intermed...

Separation of 2,3-butanediol from the fermentation broth is a difficult task that has become a bottleneck in industrial production. Aqueous two-phase systems composed of hydrophilic solvents and inorganic salts could be used to extract 2,3-butanediol from fermentation broth. The ethanol/ammonium...

In our study, oleyl oleate was synthesized through enzymatic esterification of oleic acid with oleyl alcohol using Candida rugosa lipase (CRL) immobilized on macroporous resin in a solvent-free system. CRL was immobilized flexibly on the support via aldehyde-dextran, and the effectiveness of ald...

A series of mono and bis-triazole coumarin hybrids 6a–u and 9a–f respectively have been synthesized using 4-(azidomethyl)-2H-chromen-2-ones 5a–i and aryl propargyl ethers 2a–c/8 employing Click chemistry modified protocol for Azide-Alkyne cycloadditions(CuAAC). Anti-tubercular screening show...

The rearrangement of 1,4-bis-aryloxybut-2-ynes to 4b,9b-dihydro-4b,9b-dimethylbenzofuro (3,2-b) benzofuran is described. The compounds arising from the dehydration of 2,3-(o-hydroxyphenyl)-2,3-dihydroxybutane, reported earlier in the literature, are shown to possess benzofuro-(2,3-b) benzofuran ...