Showing papers on "Acetonitrile published in 1984"
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TL;DR: In this article, a microvoltammetriques for etudier loxydation d'anthracene et de diphenyl-9,10 anthracene, dans des solvants aprotiques (acetonitrile, chlorure de methylene and dimethoxyethane) en presence de perchlorate de tetrabutylammonium.
Abstract: Utilisation d'electrodes microvoltammetriques pour etudier l'oxydation d'anthracene et de diphenyl-9,10 anthracene, dans des solvants aprotiques (acetonitrile, chlorure de methylene et dimethoxyethane) en presence de perchlorate de tetrabutylammonium
149 citations
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TL;DR: In this article, reversed-phase packings were synthesized by reaction of n-alkyldimethylchloro- and trifluoroacetoxysilanes with silicas of 15 and 25 nm pore size, employing tetrahydrofuran, N,N-dimethylformamide, benzene, diethyl ether, dichloromethane and acetonitrile as solvents and triethylamine, pyridine, triazole, quinuclidine, 2,4- and 2,6-lut
120 citations
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TL;DR: Unter der Reaktionsbedingung A) bilden sich aus einer Reihe organischer Substrate, wie im Formelschema aufgefuhrt, Monooxidations- bzw. Dehydrierungsproduke (Effektivitat: 28- 100%).
Abstract: Unter der Reaktionsbedingung A) bilden sich aus einer Reihe organischer Substrate, wie im Formelschema aufgefuhrt, Monooxidations- bzw. Dehydrierungsproduke (Effektivitat: 28- 100%).
108 citations
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TL;DR: The photosubstitution (electron transfer) reaction between 1,4-dicyanobenzene (1) and 2,3-dimethyl-2-butene (2) as discussed by the authors gave 1-(4-cyanophenyl)-2,3 -dimethyl 2-butenes (3) and 3-(4]-cyan-phenyl 2-3-di...
Abstract: The photosubstitution (electron transfer) reaction between 1,4-dicyanobenzene (1) and 2,3-dimethyl-2-butene (2), which gives 1-(4-cyanophenyl)-2,3-dimethyl-2-butene (3) and 3-(4-cyanophenyl)-2,3-di...
63 citations
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TL;DR: In this paper, a polymeric coating of a nickel-containing poly-p -phenylene, formulated as [-Ni(p -C 6 H 4 ) n -] (n = 6−7), was found to undergo a two-electron reversible reduction and a one-electRON reversible oxidation with a large potential window (3.6 V), without the polymeric film being destroyed.
63 citations
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TL;DR: In this paper, the processus de reduction et d'oxydation is considered, as well as de comportement, dans CH 3 CN, d'une serie de complexes [Ru(HDPA) n (bpy) 3−n ] 2+ (1) (n=0−3), [Ru[Ru(DPA] n (dipyridylamine deprotonee and bpy=bipyridine-2, 2,2] avec HDPA=di-pyridyl-2 am
Abstract: Resultats d'etudes, a temperatures basse et ambiante, par voltammetrie cyclique et spectrometrie, du comportement, dans CH 3 CN, d'une serie de complexes [Ru(HDPA) n (bpy) 3−n ] 2+ (1) (n=0−3), [Ru(DPA) n (bpy) 3−n ] ( 2 −n)u + (2) (n=0−3) et [Ru(HDPA) n (DPA) 3−n ] (N−1)u + (3) (n=0−3) avec HDPA=di-pyridyl-2 amine; DPA − =dipyridylamine deprotonee et bpy=bipyridine-2,2'. Donnees sur les processus de reduction et d'oxydation. Spectres RPE
56 citations
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TL;DR: Cristallisation dans le groupe Pn21a avec a=24,50, b=20,756 and c=8,567 A. Affinement jusqu'a R=0,048 as discussed by the authors.
Abstract: Cristallisation dans le groupe Pn21a avec a=24,50, b=20,756 et c=8,567 A. Affinement jusqu'a R=0,048. Coordination tetraedrique autour des atomes Ag
55 citations
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TL;DR: In this paper, linear sweep and rotated disk voltammetry have been used to characterize the effects of media and electrode activation on the electrochemical oxidation of molecular hydrogen in water, dimethylformamide (DMF), dimethyl sulfoxide (Me/sub 2/SO), pyridine (pyr), and acetonitrile (MeCN).
Abstract: Linear-sweep and rotated-disk voltammetry have been used to characterize the effects of media and electrode activation on the electrochemical oxidation of molecular hydrogen in water, dimethylformamide (DMF), dimethyl sulfoxide (Me/sub 2/SO), pyridine (pyr), and acetonitrile (MeCN). These results have been used to develop the optimum conditions for the volummetric determination of dissolved H/sub 2/ partial pressures in this group of solvents.
55 citations
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TL;DR: In this paper, the anodic oxidation of 2,6-di-t-butyl-4-methylphenolate (IId), as well as the 4-ethyl (IIc) and 4-nbutyl (IIe) derivatives, has been studied by cyclic voltammetry in acetonitrile with a platinum disk electrode.
52 citations
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52 citations
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TL;DR: In this article, an observation d'un equilibre de conformation des coordinats dans le tris(terpyridyl-2,2',2'') europium (III), en solution dans l'acetonitrile et a l'etat solide, par fluorescence and RMN de 1 H
Abstract: Observation d'un equilibre de conformation des coordinats dans le tris(terpyridyl-2,2',2'') europium (III), en solution dans l'acetonitrile et a l'etat solide, par fluorescence et RMN de 1 H
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TL;DR: A procedure for the purification of acetonitrile to a level suitable for synthetic, spectroscopic, and electrochemical work involving high oxidation state fluorides is described in this article.
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TL;DR: In this article, the lipophilicity of aniline derivatives was determined by reversed-phase thin-layer chromatography using methanol, acetone and acetonitrile as the organic phase.
Abstract: The lipophilicity of aniline and 36 ring-substituted aniline derivatives was determined by reversed-phase thin-layer chromatography using methanol, acetone and acetonitrile as the organic phase. The RM value of each compound linearly decreased with increasing concentration of the organic solvent, Acetonitrile showed the highest and methanol the lowest solvent strength, however, the difference between the solvent strength of methanol and acetone was negligible. The site of the substitution considerably influenced the lipophilicity particularly in the case of −NO2 groups. Good correlation was found between the RM value extrapolated to zero organic phase concentration and the partition coefficient between n-octanol:water. The change in the RM value caused by a 1% increase of the organic phase concentration also correlated with the partition coefficient, however, it was of secondary importance. The lipophilicity parameters determined by reversed-phase thin-layer chromatography correlated to a lesser extent with the calculated lipophilicity values of aniline derivatives.
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TL;DR: In this paper, the thermodynamic parameters for transfer of several electrolytes from propylene carbonate to dimethylsulphoxide + polycarbonate mixtures and from methanol to methanolnol + acetonitrile mixtures have been measured.
Abstract: The thermodynamic parameters for transfer of several electrolytes from propylene carbonate to dimethylsulphoxide + propylene carbonate mixtures and from methanol to methanol + acetonitrile mixtures have been measured.These data are considered in terms of recently developed solvation theory. It is found that in both systems the data can be accounted for satisfactorily in terms of a two-state model of the solvation process. In the dimethylsulphoxide + propylene carbonate system only the interactions of the solute with its coordination-shell solvent molecules need to be considered. The methanol + acetonitrile system is more complex, and the interactions of the coordination-shell solvent molecules with the rest of the solvent must also be taken into account.
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TL;DR: In this article, the authors used micellar hexadecyltrimethylammonium chloride as the mobile phase for the separation of iodate, nitrite, bromide, nitrate and iodide.
Abstract: High-performance liquid chromatography using micellar hexadecyltrimethylammonium chloride as the mobile phase is shown to provide a versatile and efficient technique for the separation of iodate, nitrite, bromide, nitrate and iodide. The mechanism of distribution of the inorganic anions using an aqueous micellar mobile phase with a hydrophobic column packing is investigated. Anion partitioning between the micelles and the mobile phase and between the conditioned stationary phase and the mobile phase both contribute to the retention of the inorganic anions. The influence of the concentrations of hexadecyltrimethylammonium chloride, sodium chloride and acetonitrile on the retention mechanism is also investigated.The application of micellar chromatography to the analysis of anions is demonstrated via the determination of nitrate and nitrite in domestic water samples.
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TL;DR: In this article, a cyclopropane acetonitrile and trimethylsilyl-2 propene-2ol-1 were prepared for trimethyl silyl 2 propene 2ol.
Abstract: On prepare le trimethylsilyl-1 cyclopropane acetonitrile et le trimethylsilyl-1 cyclopropane carbaldehyde par cyclopropanation du trimethylsilyl-2 propene-2ol-1
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TL;DR: In this paper, the second coefficient du viriel and the coefficient d'absorption preferentielle were used to measure the diffusion de la lumiere a 25°C.
Abstract: Etude par diffusion de la lumiere a 25°C. Mesure du second coefficient du viriel et du coefficient d'absorption preferentielle
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TL;DR: Etude par voltammetrie cyclique, spectrometrie RPE et UV de la reduction du complexe η 5 -cyclopentadienyl cobalt coordine au diphenyl tetrazadiene-1,3 sur une electrode de platine dans des solutions non aqueuses d'acetonitrile-tetrafluoroborate de tetrabutyl ammonium as mentioned in this paper.
Abstract: Etude par voltammetrie cyclique, spectrometrie RPE et UV de la reduction du complexe η 5 -cyclopentadienyl cobalt coordine au diphenyl tetrazadiene-1,3 sur une electrode de platine dans des solutions non aqueuses d'acetonitrile-tetrafluoroborate de tetrabutyl ammonium
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TL;DR: Reactions photochimiques en presence ou en absence d'acetone a des longueurs d'onde ≥285 nm a deslongueurs ainsi que d'une reaction de dechloration.
Abstract: Reactions photochimiques en presence ou en absence d'acetone a des longueurs d'onde ≥285 nm. Observation d'une reaction de dechloration
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TL;DR: Mesure des rendements quantiques for les photoanations des complexes au titre ou L-pyridine ou acetonitrile de −20 a +33° as mentioned in this paper.
Abstract: Mesure des rendements quantiques pour les photoanations des complexes au titre ou L-pyridine ou acetonitrile de −20 a +33°
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TL;DR: The influence of the nature and concentration of organic modifiers on retention in high-performance liquid chromatography on dynamically modified silica has been investigated in this paper, where the maximum amount adsorbable for eluents containing either methanol or acetonitrile was found to be ca. 1.2 mmol/g (ca. 2.5 μmol/m2).
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TL;DR: The photochemical reaction of substituted toluenes with CAN in CH 3 CN leads to good yields of benzyl nitrates under very mild conditions as discussed by the authors, which is the main ingredient of the benzyl-nitrate synthesis.
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TL;DR: A nucleophilic displacement reaction of methyl 3, 4-O-isopropylidene-2-O-(trifluoromethanesulfonyl)-6-O-,trityl-β-D-talopyranoside (10) with tetraalkylammonium fluorides in acetonitrile gave methyl 2-deoxy 2-fluoro-3, 4 O-ISOPropylIDene-6,O-trity l-β -D-galactopyranoiside (11) as mentioned in this paper
Abstract: A nucleophilic displacement reaction of methyl 3, 4-O-isopropylidene-2-O-(trifluoromethanesulfonyl)-6-O-trityl-β-D-talopyranoside (10) with tetraalkylammonium fluorides in acetonitrile gave methyl 2-deoxy-2-fluoro-3, 4-O-isopropylidene-6-O-trityl-β-D-galactopyranoside (11). Excellent conversion of 11 into 2-deoxy-2-fluoro-D-galactose (1) was achieved by hydrolysis with 5 N hydrochloric acid.
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TL;DR: In this paper, les proprietes des surfaces des electrodes modifiees par des groupes Ru(bpy) 2 avec bpy=bipyridyle-2,2', fixes au poly-N-vinylimidazole.
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TL;DR: In this paper, the influence of electrostriction on the mobilities of large ions in compressible polar solvents was examined and it was shown that electro-striction leads to significant augmentation of the drag coefficients of large ion in aprotic solvers such as acetonitrile and acetone.