A series of fused tricyclic coumarin derivatives bearing iminopyran ring connected to various amido moieties were developed as potential multifunctional anti-Alzheimer agents for their cholinesterase inhibitory and radical scavenging activities. In vitro studies revealed that most of these compo...

Four pairs of isostructural europium and terbium ortho-, meta, and para-aminobenzoates ([Ln(2-ABenz)3(H2O)], [Ln(3-ABenz)3(H2O)3], [Ln(3-ABenz)3(H2O)3]·3H2O, [Ln(4-ABenz)3(H2O)], (Ln = Eu, Tb; ABenz – aminobenzoate anion)) were investigated using X-ray diffraction and optical spectroscopy (lum...

Ethnopharmacological relevanceMexican people employed infusion of leaves of Choisya ternata Kunth for their antispasmodic and “simulative properties”.

An amphiphilic graft polyphosphazene (PNIPAm/EAB-PPP) composed of oligo-poly(N-isopropylacrylamide) (PNIPAm) as hydrophilic segments and ethyl 4-aminobenzoate (EAB) as hydrophobic groups was synthesized via ring-opening polymerization and subsequent substitution reaction. The molar ratio of the ...

Four monoclonal antibodies (mAbs) against 4-aminobenzoate hydroxylase (EC 1.14.13.27) have been produced (H. Tsuji et al., J. Biol. Chem. 265 (1990) 16064; T. Ogawa et al., Biochim. Biophys. Acta 1115 (1992) 220). Of the mAbs, three mAbs (mAb-A, -B1 and -B2) recognize the FAD-binding domain of t...

One-pot synthesis of 3-aryl-4(3H)-quinazolinones has been realized through a cascade annulation. Reaction of aryldiazonium salt with a nitrile provides in situ generation of a reactive nitrilium ion, which is attacked by the amino group of 2-aminobenzoate followed by cyclization to deliver the d...

N-2-(6-aminopyridine)-N′-2-methoxyphenylthiourea, 6AmTu2OMe, monoclinic, C2/c, a=16.3150(17), b=11.3000(13), c=14.8970(9)Å, β=101.219(7)°, V=2693.9(4) Å3 and Z=8; N-2-(6-aminopyridine)-N′-4-chlorophenylthiourea, 6AmTu4Cl, monoclinic, P21/n, a=14.2080(9), b=9.8060(7), c=19.041(1) Å, β=104.61...

A practical approach to synthesize 2-aminothiazolo[5,4-c]pyridines from simple asymmetric pyridylthioureas was achieved by utilizing K3[Fe(CN)6] as the oxidant. These reactions went through an intramolecular oxidation and finally led to the formation of CS bond. Furthermore, the possible oxidati...

Ru(III) ion-imprinted bio-adsorbent based on 2-pyridylthiourea modified chitosan (Ru-PTCS) had been manufactured, investigated and employed for selective extraction of Ru(III) ions from aqueous medium containing interfering metal ions that maybe coexist and compete with Ru(III) ions. Elemental a...

The present paper describes the synthesis and spectral properties of Rh(III) and Pd(II) coordination compounds with N-(pyridine-2-yl)morpholine-4-carbothioamide (PMCTA). The compounds have the general composition [RhL2Cl2]Cl · C2H5OH (1), [PdL2]Cl2 (2), [PdL2](ClO4)2 · 2C3H6O (2a), [PdLCl2] ·...

A series of novel zinc(II), nickel(II) and palladium(II) complexes with a thiourea derivative (N-(2-pyridinyl)morpholine-4-carbothioamide) (HL) and its oxidation product (N-(2-pyridinyl)morpholine-4-carboxamide) (HL′) have been synthesized and characterized by single crystal X-ray diffraction s...

New palladium(II) and platinum(II) complexes with didentate ligands derived from 1-phenylazo-2-naphthylamine and 2-(diphenylphosphino)benzaldehyde or 2-(tert-butylthio)benzaldehyde have been prepared and their structures are determined by X-ray crystallography. The palladium(II) and platinum(II)...

Palladium(II) and platinum(II) complexes, [PdX(NS3 1Bu)]BPh4 (X=Cl, Br, I; NS3 1Bu=tris[2-(tert-butylthio)ethyl]amine) and [PtCl(NS3 1Bu)]BPh4, were prepared, and their structures were determined by X-ray analyses. The geometry around the palladium and platinum atoms is square planar. The NS3 1B...

In this paper the oxidation of sodium dithionite in alkaline solution was studied by cyclic voltammetry at a stationary and rotating platinum disk electrode. The reaction proceeds in two steps, with sulfite as a relatively stable intermediate and sulfate as final product. It was possible to quan...

BackgroundParaquat poisoning can be lethal, and aggressive treatments might have little or no effect on severely poisoned patients. Accordingly, a convenient prognostic test is necessary to guide therapy for acute paraquat poisoning. Sodium dithionite reduces paraquat to a blue radical form in a...

The role of the surface condition of a gold electrode in the electrochemical behaviour of sodium dithionite and sulfite has been studied in alkaline solution. Dithionite is oxidised to sulfate in two steps, with sulfite as the intermediate. Both limiting currents of the corresponding waves obey ...

The effect of brief anoxia on voltage dependent K+-currents of hippocampal cultured neurons was studied. The oxygen scavenger dithionite (hydrosulphite) was previously used for creating zero oxygen pressure. However, dithionite consumes O2 in parallel with generation of superoxide radicals and i...

Nowadays, in most indigo dyeing processes the reduction step is performed chemically by sodium dithionite. This is considered environmentally unfavourable because of the resultant contaminated wastewaters. So, there has been interest to find new possibilities which would be ecologically more att...

The kinetics and mechanism of the oxidation of the sulfite (SO32−), thiosulfate (S2O32−) and dithionite (S2O42−) ions by ferrate (FeO42−) ions was studied under pseudo-first-order conditions and, in addition, the reaction with thiosulfate ions was studied under non-pseudo-first-order conditions....

According to the recently rumors about abusing of sodium dithionite (SDT) in baking bread by some bakers, we motivated to plan a study to fabricate an electrochemical SDT sensor. This work reports our results on fabricating a novel and high performance electrochemical sensor based on AuPd nanopa...