Showing papers on "Acetonitrile published in 1975"
146 citations
TL;DR: In this article, the partial molal volumes of both components of the mixed system have been calculated and deviations from ideal volumes of mixing have been evaluated; structural correlations have been made with previous results on acid-base properties; they allow to distinguish several interaction regions between components of binary systems.
108 citations
TL;DR: In this article, a hygroscopic complex (Complex 1), an active phosphorylating agent in the present phosphorylation of nucleosides, was identified as an adduct composed of tetrachloropyrophosphate and pyridinium chloride.
Abstract: 5′-Nucleotides were directly prepared by selective phosphorylation with phosphoryl chloride in the presence of water and pyridine in acetonitrile. The rate of phosphorylation with phosphoryl chloride was markedly improved by the addition of suitable amounts of water and pyridine; the maximal formation of 5′-nucleotides was obtained by mixing these three reactants phosphoryl chloride, water, and pyridine in a molar ratio of 2 : 1 : 2 at a low temperature, followed by adding nucleosides corresponding to a one-fourth or one-fifth of the phosphoryl chloride. By mixing phosphoryl chloride, water, and pyridine in acetonitrile under controlled conditions, a hygroscopic complex (Complex 1), an active phosphorylating agent in the present phosphorylation of nucleosides, was isolated. It was identified as an adduct composed of tetrachloropyrophosphate and pyridinium chloride by means of its infrared spectra and by its chromatographic behavior. One of the proposed structures of the adduct is trichloropyrophosphopyrid...
108 citations
TL;DR: In this paper, a double potential step experiment was used to characterize the oxidation of the phenoxy radical, showing that the current during the second step is unusually small because protons produced by the oxidization of the radical deactivate the phenoxide.
98 citations
TL;DR: In this article, the adsorption of acetonitrile CH3CN and CD3CN on to a δ-Al2O3 sample has been studied by i.r. spectroscopy.
Abstract: The adsorption of acetonitrile CH3CN and CD3CN on to a δ-Al2O3 sample has been studied by i.r. spectroscopy. The nitrile is coordinately bonded to exposed Al3+ ions or H-bonded to surface hydroxyl groups. Fermi resonance between the 2 fundamental and the (3+4) combination in the two adsorbed species is discussed and the positions of the unperturbed vibrations are estimated. An assignment of the Fermi resonance doublet in the coordinated species is given. The CN stretching vibration seems not to be very sensitive to energetic heterogeneities among the exposed cations. I.r. and Raman spectra of adsorbed t-butyl cyanide are also discussed.
87 citations
TL;DR: In this paper, the formation of the unstable species (CH3)3Si(NCCH3n)n from the electrochemical oxidation of (CH 3)3 SiSiSi(CH 3 n) in acetonitrile was investigated.
77 citations
TL;DR: In this paper, the electrochemical oxidation of seven different nitroxyl radicals has been investigated in acetonitrile at a platinum electrode, and the electrostatic solvation enthalpies of two oxammonium ions were calculated.
58 citations
TL;DR: In this paper, the preferential solvation of the Na+ ion was studied by determining the 23Na chemical shifts for sodium tetraphenylborate solutions in all possible binary solvent mixtures of nitromethane, acetonitrile, hexamethylphosphoramide, dimethylsulfoxide, pyridine and tetramethylurea.
53 citations
47 citations
TL;DR: In this paper, reverse phase partition chromatography is applied to a 10 micron silica-bonded octadecyl hydrocarbon substrate to the separation of neutral tetradentate chelates of copper, nickel and palladium.
Abstract: Reverse phase partition chromatography on a 10 micron silica-bonded octadecyl hydrocarbon substrate is applied to the separation of neutral tetradentate chelates of copper (II), nickel (II) and palladium (II) with a range of non-fluorinated and fluorinated beta-ketoamine and salicylaldimine ligands. Variation of retention and resolution with respect to changes in ligand structure and metal chelated is investigated using acetonitrile, methanol and water solvent systems. Detection limits (254 nm) and linearity ranges of response are indicated.
39 citations
TL;DR: Some reactions of the title compound with several ligands, including olefins and acetylenes have been conducted and the new complexes trans-[NiH{P(C6H11)3}2L]BF4, L = methylpyridine or acetonitrile... as mentioned in this paper.
Abstract: Some reactions of the title compound with several ligands, including olefins and acetylenes have been conducted and the new complexes trans-[NiH{P(C6H11)3}2L]BF4, L = methylpyridine or acetonitrile...
TL;DR: In this article, the synthesis of 2,2′-O-anhydro(1-β-D-arabinofuranosyl) cytosine and uracil is described.
Abstract: The synthesis of 2,2′-O-anhydro(1-β-D-arabinofuranosyl) cytosine (3a) and 2,2′-O-anhydro(1-β-D-arabinofuranosyl) uracil (3b) is described. The active intermediates, 2′,3′-O-sulfinyl cytidine (2a) and 2′,3′-O-sulfinyl uridine (2b), were prepared from the corresponding nucleosides (1a or 1b) by successive treatment with thionyl chloride in acetonitrile and with water. The 2,2′-O-anhydropyrimidine nucleosides were formed quantitatively by heating the intermediates in an acidic aqueous solution or in N,N-dimethylformamide in the presence of sodium acetate. The treatment of the anhydronucleosides with alkali gave the corresponding arabinonucleosides.
TL;DR: In this paper, the solvent dependent π-acceptor properties of isonicotinonitrile, acrylonitrile and benzodinitriles have been investigated.
TL;DR: In this article, the authors showed that 1-phenylcyclopentene, 1-cyclohexane, and 2-p-norbornene in methanol, acetic acid-dioxan, and aqueous acetonitrile solution, with methyl p-cyanobenzoate or 1-cyanonaphthalene as sensitiser (electron-transfer), gives fair yields of the product resulting from anti-Markovnikov addition of the nucleophilic solvent to the olefin.
Abstract: Irradiation of 1-phenylcyclopentene, 1-phenylcyclohexane, and 2-phenylnorbornene in methanol, acetic acid-dioxan, and aqueous acetonitrile solution, with methyl p-cyanobenzoate or 1-cyanonaphthalene as sensitiser (electron-transfer), gives fair to good yields of the product resulting from anti-Markovnikov addition of the nucleophilic solvent to the olefin.
TL;DR: Raman spectroscopy has been employed to follow the relatively slow rate of hydrolysis of acetonitrile, catalyzed by mercury(II) as discussed by the authors, and Raman lines at 2275 and 2305 cm−1 are characteristic of CH3CN bounding boxes.
Abstract: Raman spectroscopy has been employed to follow the relatively slow rate of hydrolysis of acetonitrile, catalyzed by mercury(II). Raman lines at 2275 and 2305 cm−1 are characteristic of CH3CN bound ...
TL;DR: In this article, internal vibrations of the CF3CO2− anion of the lithium trifluoroacetate dissolved in acetonitrile or dimethylsulphoxide were analyzed.
TL;DR: The relatively high rates of p-nitrophenol liberation in the presence of glucose even at high organic solvent concentrations suggest that transphosphorylation is facilitated at low water activity.
TL;DR: In this paper, the TiCl3H2O2 radical-generating method within a continuous-flow system at 25 ± 2°C was used to characterize the spectrum of every radical that could conceivably be formed by hydrogen-atom abstraction from carbon.
TL;DR: Several epoxides have been converted into Δ2-oxazolines by reaction with acetonitrile or benzonitrile in the presence of boron trifluoride-ether complex; yields are much higher than when reaction is brought about with sulphuric acid or tin(IV) chloride as discussed by the authors.
Abstract: Several epoxides have been converted into Δ2-oxazolines by reaction with acetonitrile or benzonitrile in the presence of boron trifluoride–ether complex; yields are much higher than when reaction is brought about with sulphuric acid or tin(IV) chloride. The position of insertion of the nitrile and the stereochemistry of the ring enlargement are discussed.
TL;DR: The reduction mechanism of bis 2,2′,2″-terpyridine complexes of manganese, cobalt, nickel, and europium was investigated in acetonitrile by means of DC and AC polarograph and Kalousek polarograph at DME and cyclic voltammetry at an HDME as discussed by the authors.
Abstract: The reduction mechanism of bis 2,2′,2″-terpyridine complexes of manganese(II), cobalt(II), nickel(II) and europium (III) were investigated in acetonitrile by means of DC and AC polarograph and Kalousek polarograph at DME and cyclic voltammetry at an HDME. It was found that univalent metal complex anions, such as [M-(terpy)2]− (M=manganese and nickel), were formed at the electrode surface in acetonitrile. For the europium(III) complex, the standard rate constant of the second reduction step was estimated.
TL;DR: In this article, the electrochemical behavior of di(1,2-bisdiphenylphosphinoethane)M(1) perchlorate (M = Co, Rh, Ir) has been investigated on the mercury electrode in acetonitrile under a carbon monoxide atmosphere.
TL;DR: In this article, the conformational equilibrium of 3-chloro and 3-bromotetrahydropyran were measured by NMR and IR spectroscopy using model 2-alkyl-5-halotetrahedropyrans.
TL;DR: In this article, high precision conductance measurements were reported for sodium, potassium, and rubidium tetrafluoroborate and hexafluorophosphate in acetonitrile at 25 °C.
Abstract: High precision conductance measurements are reported for sodium, potassium, and rubidium tetrafluoroborate and hexafluorophosphate in acetonitrile at 25 °C. The results are analyzed using the expan...
TL;DR: In this paper, the conductances of tetramethylammonium and tetrahexylammmonium perchlorates in acetonitrile and tetramerethylammium and trichloroethane perchlorate in methanol have been measured at 25°C.
Abstract: The conductances of tetramethylammonium and tetrahexylammonium perchlorates in acetonitrile and of tetramethylammonium and tetraethylammonium perchlorates in methanol have been measured at 25°C. These data combined with other literature data allow an analysis of the association behaviour of perchlorate salts with cations of different sizes in the isodielectric solvents methanol and acetonitrile. The association constants found in methanol differ in magnitude and in cation dependence from those in acetonitrile. These results are discussed in terms of the influence of ion-solvent interactions on ion pairing.
TL;DR: Trialkyiboranes are readily electrolyzed by using two platinum plates as the electrodes in an acetonitrile solution containing tetraalkylammonium halide to give corresponding aliphatic nitriles in good yields as discussed by the authors.
Abstract: Trialkyiboranes are readily electrolyzed by using two platinum plates as the electrodes in an acetonitrile solution containing tetraalkylammonium halide to give corresponding aliphatic nitriles in good yields.
TL;DR: In this paper, the carbon-13 magnetic shielding anisotropy in acetonitrile-1-13 C has been obtained from studies in a liquid crystal solution using a pulsed FT NMR spectrometer.