Mir Hedayatullah

Anodic oxidation of 5-amino-1,4-naphthoquinone (ANQ) and synthesis of a conducting polymer (PANQ)

The electrooxidation of 5-amino-1,4-naphthoquinone (ANQ) at glassy carbon and Pt electrodes in acetonitrile leads to functionalized polymer films. Results from different spectroscopic techniques (FT-IR, UV-Vis, X-ray photoelectron spectroscopy (XPS)) and frontier orbital considerations converge to a definition of poly(5-amino-1,4-naphthoquinone) (PANQ) structure which is of the polyaniline-type bearing one quinone group per ANQ moiety.

Electrosynthesis of a new enzyme-modified electrode for the amperometric detection of glucose

The electrooxidation of a new aminonaphthalene compound modified with a carboxylic acid function, 1-(5-aminonaphthyl)ethanoic acid (ANEA) was studied, with a view to binding glucose oxidase (GOD) covalently. Its electrooxidation leads to thin films (PANEA) on bare glassy carbon (GC) platinum (Pt) electrodes and also on prepolymerized aminonaphthoquinone (PANQ) films. Polymer-modified bilayer electrodes Pt/PANQ/PANEA were then constructed. GOD was covalently bound onto these electrodes, leading to a Pt/PANQ/PANEA/GOD glucose sensor. The amperometric response to glucose was monitored in aerated and deaerated conditions. The results show very efficient covalent binding of GOD and good enzyme activity on the electrode surface.

Poly [(1-methylene-2-methylnaphthalene) -N-pyrrole] : a new fluorophore-containing electroactive conducting polymer 1

Abstract A new fluorophore-containing polymer, poly [(1-methylene-2-methylnaphthalene)- N -pyrrole] (PMNPy), was electrosynthesized by anodic oxidation of the corresponding monomer (MNPy) in 0.1 M tetrabutylammonium perchlorate (TBAClO 4 ) or 0.1 M tetrabutylammonium tetrafluoroborate (TBABF 4 ) acetonitrile solution and characterized spectroscopically. An electroactive PMNPy film was formed either by cyclic voltammetry between −0.4 and 1.3 V versus Ag/AgCl or at controlled potential (1.3 V). FT-IR studies indicate that this polymer has a linear structure, with 2,5 coupling on the pyrrole moiety. Scanning electron microscopy (SEM) analysis shows that oxidized PMNPy films have a globular structure, with thicknesses ranging between 0.4 and 1.3 μm. UV absorption, excitation and emission fluorescence spectra were performed on PMNPy and the corresponding monomer. The fluorescence properties of the polymer in acetonitrile solution as well as in the solid state indicate the persistence of a naphthalene-like emission.

A new functionalized conductive polymer poly(2-methyl-5-amino-1,4-naphthoquinone) (PMANQ) with two distinct redox systems

Abstract The electrooxidation of 2-methyl-5-amino-1,4-naphthoquinone (MANQ) on platinum or glassy carbon (GC) electrodes in acetonitrile leads to poly(2-methyl-5-amino-1,4-naphthoquinone) (PMANQ) films. Films were characterized by UV–VIS, X-ray photoelectron spectroscopy (XPS), ex situ FT-IR and in situ multiple internal reflection FT-IR spectroscopies (MIRFT-IRS). Results converge to a definition of the polymer structure, which is of the polyaniline type, bearing one methylquinone group per monomer unit. The electrochemical properties of PMANQ film in organic and aqueous media were studied by MIRFT-IRS and in situ d.c. conductivity. The film is conducting in negative as well as in positive potential range.

Two-Phase Systems. 4. Easy and Efficient Alkylation and Aralkylation of Barbiturates Using Phase Transfer Catalysis

Abstract The alkylation of barbiturates, particularly in toxicology to detect poisoning arising from excessive intake, has attracted a great deal of attention.1 Some of the techniques are: flash alkylation,2 the use of diazomethane methanol solution,3 dimethyl sulfate,4 methyl iodide with potassium carbonate, 5N,N-dimethylformamide dimethyl acetal,6 extractive alkylation,7–9 Greeleys method involving the use of alkyl iodides in anhydrous dimethylacetamide-methanol.

Conditions Optimales de Destruction Chimique Totale, Rapide et Douce Du Paraoxon Et Du Parathion Par Le Monoperphtalate De Magnesium (MPPM) Et Le Monopersulfate De Potassium (Curox)

Abstract Nous decrivons ici les conditions optimales de destruction totale et douce du paraoxon et du parathion par le monoperphtalate de magnesium et le monopersulfate de potassium dans differents milieux micellaires. Cest le premier de ces peracides qui se revele le plus efficace avec des temps de demireaction de destruction des deux toxiques, respectivement de 3 et 9 secondes.

SYNTHESES A L'AIDE D'HETEROCUMULENES. 3.† NOUVELLES OXAZOLIDINONES-2 ET IMIDAZOLIDINONES-2 A PARTIR DE L'ISOCYANATE DE PHENOXYSULFONYLE

Abstract Nous rapportons ici, la premiere utilisation en synthese heterocyclique de lisocyanate de phenoxysulfonyle, un heterocumulene simple dacces, qui reagit avec les ω-halogenoalcools et les β-halogenoethyl-amines pour fournir une nouvelle famille doxazolidinones-2 et dimidazolidinones-2. We report here, the first use in heterocyclic synthesis of the phenoxysulfonyl isocyanate that reacts with ω-halogeno-alcools and β-halogeno-ethylamines to give a new family of 2-oxazolidinones and 2-imidazolidinones.

Synthèse de Fluorosulfates D'Aryle Encombres

Abstract Par action du fluorure de sulfuryle sur les sels de lithium des phenols (1a[sbnd]c), a -60°, nous avons synthetise, avec des rendements tres eleves, les premiers fluorosulfates daryl encombres (2a[sbnd]c) renfermant en positions 2 et 6 un groupe tertiobutyle. By reaction of sulfuryl fluoride with the lithium salts of phenols (1[sbnd]c), at -60°, we have synthetized, in high yield, the first sterically hindered aryl fluorosulfates (2a[sbnd]c) having a t-butyl group in the 2 and 6 positions.

SYNTHÈSES A L'AIDE D'HETÉROCUMULÈNES. 4

Abstract The synthesis of the N-chlorosulfonylcarbamates derived from seven hindered phenols is described, as well as their hydrolysis giving a high yield of the corresponding simple carbamates, the selective substitution of their chlorine atom by the anilino radical (with formation of a new family of N-substituted carbamates) and their thermolysis which takes places differently depending on the starting phenol substituents and hence on the sensitivity of the latter to oxidation.

INTRODUCTION DE SYSTÈMES CAGE DANS LES MOLÉCULES D'INTÉRĚT BIOLOGIQUE. 2. ALKYLATION DES ESTERS SULFAMIQUES AU MOYEN D'UN DÉRIVÉ DE L'ADAMANTANE

Abstract Sulfamic esters of the general type R[sbnd]O[sbnd]SO2[sbnd]NH2 were alkylated under solid-liquid, liquid-liquid phase transfer catalysis conditions and by noncatalytic procedure, in homogeneous medium, in the presence of an equimolar amount of triethylamine, by means of a 1-adamantyl bromomethyl ketone. According to the procedure and the nature of R, these reactions yield the N-monoalkyl, N-dialkyl derivatives or a cleavage of the O[sbnd]SO2 bond with formation of the O-alkylation products. Nous decrivons lalkylation des esters sulfamiques de formule generale R[sbnd]O[sbnd]SO2[sbnd]NH2 au moyen de ladamantyl-1 bromomethyl-cetone, en catalyse par transfert de phase solide-liquide, liquide-liquide et dans les conditions non-catalytiques, en phase homogene et en presence dune quantite equimoleculaire de triethylamine. Selon la methode utilisee et la nature du radical R. on aboutit a des derives N-monoalkyles, N-dialkyles ou a la scission de la liaison O[sbnd]SO2 avec formation de produits de O-al...