Novel, aryloxy- and arylalkyloxy-substituted pyrazine dicarbonitriles were synthesized from 5,6-dichloropyrazine-2,3-dicarbonitrile and the corresponding phenol/alcohol derivatives. Cyclotetramerisation of these pyrazine derivatives to form metal pyrazinoporphyrazines in the presence of appropri...
Poly(2-methoxy-(5-(6′-dimethylphosphonate)-hexyloxy)-1,4-phenylenevinylene-ran-2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylenevinylene) (MEH-PO-PPV) was synthesized via Heck coupling reaction of MPOHOB-2Br (1) (1-methoxy-(4-(6-dimethylphosphonate)-hexyloxy)-2,5-dibromobenzene), MEHOB-2Br (2) (1-m...
(1R,2R,4R,6S)-1,6-Epoxy-2,4-bis-benzyloxycyclohexane was prepared from (−)-quinic acid and this, and cyclohexene oxide, were treated with various N-nucleophiles uunder a variety of conditions. In aqueous solution containing catalytic amounts of ytterbium (III) triflate, ammonia and alkylamines r...
PhtA, a Streptococcus pneumoniae polyhistidine triad protein, which contributes to virulence by interacting with components of the immune system, by being involved in adherence of bacteria and in Zn(II) uptake, contains five copies of the HxxHxH sequence. Since this motif is also present in nume...
A novel lipase gene (McLipB) was cloned from a thermophilic fungus Malbranchea cinnamomea and expressed in Pichia pastoris. The deduced amino acid sequence of the lipase (McLipB) shared the highest identity of 46% with the Candida rugosa lipase LIP4. The extracellular lipase activity of 4304 U/m...
Evidence indicates that prostates exposed to environmental endocrine disruptors and trace metals will cause adverse health outcomes. We assessed the association between urinary phthalate metabolites and serum trace metal levels, and oxidative damage in benign prostatic hyperplasia (BPH) patients...
Di-n-butyl phthalate (DBP) and di-2-ethylhexyl phthalate (DEHP) are two kinds of widely-used phthalates, whereas Cu (II) is a common valence state of copper. They have been ubiquitously detected in the aquatic environment, but information on their joint toxicity on aquatic organisms is scarce. I...
A leitmotiv in the field of molecular magnetism is the study of the electron exchange (EE) magnetic interactions among distant metal centers through the corresponding bridging ligands in polynuclear coordination compounds. The present review provides a historical perspective on the use of dinucl...
The adsorption and desorption of dimethyl phthalate (DMP) on five types of carbon nanotubes (CNTs) were studied in the absence and presence of 50 mg/L copper(II) (Cu2+) ion. The adsorption and desorption data are well described by the Freundlich model and the first-order two-compartment model, r...
In this study, the presence of Cu(II) ions was found for the first time to severely inhibit +-dimethyl phthalate (DMP) degradation by ozone due to the formation of the stable complex Cu(II)-DMP. However, 100% DMP removal was rapidly reached when ethylenediamine tetraacetic acid (EDTA) was added ...
From the reaction of Cu(Pht)(H2O) (Pht = o-benzene dicarboxylate) with pyrazole (Hpz), four different 1D or 2D Coordination Polymers (CPs), [Cu(Pht)(Hpz)2]·CH2Cl2, 1, [{Cu(Pht)(Hpz)4}3]·3.5Hpz·H2O, 2, [{Cu(Pht)(Hpz)2}2·0.5H2O], 3, and [Cu(Pht)(Hpz)2], 4, where Pht dianions bridge two or thre...
Summarygem-Difluoroalkenes have steric and electronic profiles similar to those of ketones, aldehydes, and esters, and consequently have been used widely as carbonyl isosteres in modern drug discovery. Although many attempts have been made to achieve gem-difluoroalkenes, the induction of enantio...
Microperoxidase-11 (MP-11), prepared by pepsin digestion of cytochrome c, contains protoheme IX and one proximal histidine ligand. MP-11 oxygenated N-methylcarbazole, methyl phenyl sulfide, and phenacyl phenyl sulfide with 80%, 100%, and 96%18O atom incorporation from H218O2, respectively. These...
Mechanistic mode for the oxygenation of sulfides with the pig liver microsomal FAD-containing monooxygenase (EC 1. 14. 13. 8) has been conveniently distinguished from that with the phenobarbital induced liver microsomal cytochrome P-450 by analyzing products of the oxygenation of phenacyl phenyl...
Visible light-mediated photoredox catalysis enables the chemoselective reduction of activated carbon–heteroatom bonds as a function of reduction potential. The expansion of the scope of C–X bond reductions towards less activated motifs, such as ethers, amines and sulfides, is important to both...
Two novel solid binary complexes of rare earth perchlorate with phenacyl p-tolyl sulfoxide were synthesized and characterized by elemental analysis, molar conductivity, coordination titration analysis, IR, TG-DSC, 1HNMR and UV spectra. The results indicated that the composition of these complexe...
The polarographic reduction of phenacyl phenyl sulphoxide gives rise to two well-defined waves in an ethanol buffer solution of pH 7 in the presence of Triton X-100; the half-wave potential of the first wave is less negative by about 0.28 V than that of phenacyl phenyl sulphide, the second one c...
Investigations were made of the effects of various modifications of the ether moiety alkoxyiminomethylphenyl N-methylcarbamates on the selective toxicity of the compounds to mouse vs. housefly. The highest mammalian selectivity ratio was found with o-(isopropyloxyiminomethyl)-phenyl N-methylcarb...
Photodegradation of metsulfuron-methyl, a sulfonylurea herbicide, has been investigated in aqueous solution at different pH and excitation wavelengths. The efficiency of the process has been evaluated through quantum yield determinations. The identification of the photoproducts indicates that th...
The present study describes a simple, reliable and reproducible liquid chromatography–tandem mass spectrometry method (LC–MS/MS) for the simultaneous determination of allopurinol and its active metabolite, oxypurinol in human plasma for a pharmacokinetic/bioequivalence study. After protein pre...
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