This work for the first time shows possible advantage of using ferrous as a catalyst to selectively oxidise hydrogen sulphide in sewer water where biological activity is present. Ferrous catalysed the oxidation reaction in all conditions, but the oxygen requirement for the chemical oxidation of ...

Recovery hydrogen from hydrogen sulfide is an effective way of utilizing exhaust gas. In this paper, removal of hydrogen sulfide by indirect electrochemical process was studied using acidic aqueous solution of Fe3+/Fe2+ as the electrochemical intermediate. Solid polymer electrolyte was applied t...

Hydrogen sulfide scavenging is one of the preferred methods for minimizing the operational risks and corrosion in crude oil production facilities. This paper deals with the determination of the optimum values of retention times of scavenging hydrogen sulfide from the crude oil produced at differ...

Hydrogen sulfide (H2S) is part of a suite of small reactive molecules which are known to be involved in cell signaling events in plants. It is produced by cells, can move around, including through membranes, and can be removed when no longer needed. It is perceived by cells, partly through persu...

A method was developed to determine low concentrations of polysulfide ions (Sn2− expressed as zero-valent sulfur) in situ and in the presence of high concentrations (0.5 mol dm−3) of hydrogen sulfide ions, HS−, at pH 14. UV–visible spectrophotometry was used to determine absorbances at 295 and ...

The photochemical rearrangement of 2,3-disubstituted quinoxaline-1,4-dioxides to 1,3-disubstituted benzimidazolones has been examined. Evidence against the previously reported mechanism is offered, and an alternative mechanism suggested. The scope of the reaction is increased to include new type...

New blue phosphorescent iridium(III) complexes containing 2-phenylpyridine derivatives as the main ligands and 4-substituted picolinates as the ancillary ligands were synthesized and their photophysical properties were investigated. In addition, the structures of three of the iridium(III) comple...

The N-methylation of 4-phenylpyridine produces the neurotoxin 1-methyl-4-phenylpyridinium ion (MPP+). We investigated the kinetics of 4-phenylpyridine N-methylation by nicotinamide N-methyltransferase (NNMT) and its effect upon 4-phenylpyridine toxicity in vitro. Human recombinant NNMT possessed...

The paper presents the results of spectroscopic studies of 4-([1,2,4]triazolo[4,3-a]pyridin-3-yl)-6-methylbenzene-1,3-diol (TPBD), which indicate that the molecular organization of the compound is altered in different solvents and at different concentrations. The results were obtained from two s...

1-Furan-2-yl-3-pyridin-2-yl-propenone (FPP-3) has recently been synthesized and characterized to have an anti-inflammatory activity. In the present study, pharmacokinetic parameters for FPP-3 and its metabolites were determined at the same time by using high-performance liquid chromatography-ult...

In this communication the corrosion behaviour of three metal [Co(II), Ni (II) and Fe (III)] complexes of Antipyrine based azo dye ligand [5-[(1,5-dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)diazenyl]-6-hydroxy-1,4-dimethyl-2-oxo-1,2-dihydropyridine-3-carbonitrile](L) for soft-cast steel ...

In this study, the synthesis, in vitro anti-Candida activity and molecular modeling of 4-phosphorylated derivatives of 1,3-oxazole as inhibitors of Candida albicans fructose-1,6-bisphosphate aldolase (FBA-II) are demonstrated and discussed. Significant similarity of the primary and secondary str...

The sequence Aib-Gly-Aib which corresponds to the N-terminus of the microheterogeneous peptide antibiotic trichotoxin has been studied crystallographically in the context of different protecting groups. Peptides Ac-Aib-Gly-Aib-OH (A) and Z-Aib-Gly-Aib-OH (B) form β-turns. Both peptides show a r...

A combinational study of structural chemistry and dyestuff chemistry has been carried out to reveal the structure–performance relationship for eight disperse azo dyes by comparing their structures, electronic spectra, solvatochromism and theoretic computations. All eight structural analogues ha...

3-Amino-5-phenyl-2-ethoxycarbonylthieno[2,3-c]pyridazine (6) was prepared by reaction of 4-cyano-6-phenylpyridazine-3(2H)-thione (4) with ethyl chloroacetate in the presence of sodium ethoxide. Hydrazinolysis of compound 6 yielded the corresponding carbohydrazide, (9) which on treatment with ace...

Ethyl benzoylacetate undergoes Claisen condensation reaction with malononitrile to afford 2-cyano-5-phenyl-3,5-dioxopentanonitrile which could be cyclized into 2-aminopyran and coupled with diazonium salts to afford azo derivatives. These azo derivatives and those of ethyl benzoylacetate could b...

A novel reaction between 2-amino-5-arylazonicotinonitriles 3c–g and dimethylformamide dimethylacetal (DMF-DMA), leading to the formation of a new class of pyrazolo[3,4-c]-pyridine derivatives 8, has been developed. The process is believed to take place via a non-concerted [4+1] cycloaddition pa...

Several phenylalanine analogs have been synthesized through a four-step route starting from easily available ethyl acetamidocyanoacetate. In a first reaction, and making use of phase transfer catalysts, this compound reacted with several alkyl halides, being benzyltributylammonium chloride ident...

Dipeptidyl peptidase IV (DPP-IV) inhibitors are promising antidiabetic drugs, and several drugs are in the developmental stage. We previously reported that the introduction of fluorine to the 4-position of 2-cyanopyrrolidine enhanced the DPP-IV inhibitory effect. In the present report, we examin...

In the present paper, we report the photochemical behavior of the n-propyl α-cyano-4-[2-(4-pyridyl)ethenyl]cinnamate (1) crystal and the crystallographic results for 1 and for the dimer which was derived topochemically from the crystal of 1.