Showing papers on "Acetonitrile published in 1972"
TL;DR: The thermal decomposition of polyester and polyether flexible foam in a nitrogen atmosphere has been studied by gas chromatography, mass spec-trometry and elemental ultramicroanalysis.
Abstract: The thermal decomposition of a polyester and a polyether flexible foam in a nitrogen atmosphere has been studied by gas chromatography, mass spec-trometry and elemental ultramicroanalysis. It is shown that the decomposition behaviours of the two foams are similar. At low temperatures (200 to 300 °C) there is a rapid and complete loss of the tolylene diisocyanate unit of each foam as a volatile yellow smoke leaving a polyol residue. The smoke has been isolated as a yellow solid (common to both foams) which contains virtually all of the nitrogen of the original foams and, under the conditions of test, is stable at temperatures up to 750 °C. Nitrogen-containing products of low molecular weight (mainly hydrogen cyanide, acetonitrile, acrylonitrile, pyridine and benzonitrile) observed during the high temperature decomposition (over 800 °C) of the foams are shown to be derived from the yellow smokes. At 1000 °C, approximately 70% of the available nitrogen has been recovered as hydrogen cyanide.
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TL;DR: In this paper, a cyclic polyether was added to solutions of constant ionic strength to give association constants and equivalent conductances of the cation-polyether complex, and the selectivity observed for the complexing is a function not only of ionic size but also of solvent.
Abstract: Precise conductance measurements are reported for sodium, potassium, and cesium salts in methanol and acetonitrile solutions containing cyclic polyethers dibenzo-18-crown-6 and dicyclohexyl-18-crown-6. Decreases in equivalent conductance caused by the addition of a cyclic polyether to solutions of constant ionic strength were analyzed by nonlinear least squares to give association constants and equivalent conductances of the cation-polyether complex. The selectivity observed for the complexing is a function not only of ionic size but also of solvent.
58 citations
TL;DR: In this paper, the solvation of a variety of ions by the dipolar aprotic solvents acetonitrile, sulfolane, and dimethylsulfoxide was studied through the influence of salts on the proton magnetic resonance chemical shifts of the Solvents.
Abstract: The solvation of a variety of ions by the dipolar aprotic solvents acetonitrile, sulfolane, and dimethylsulfoxide was studied through the influence of salts on the proton magnetic resonance chemical shifts of the solvents. In the case of acetonitrile the results were supplemented with infrared measurements, which showed that in general anions affect only the C−H and cations both the C−C and particularly the C≡N stretching frequencies of acetonitrile. The results are discussed in conjunction with transport and other data already in the literature. Current views on the structure of these solvents are summarized.
57 citations
TL;DR: Medium effects, my, of several electrolytes in acetonitrile and ethanol-water solvents were calculated from new and literature data and according to all three estimates of the medium effects for the proton, the basicity of ethanol- water mixtures is greater than that of the pure solvent and passes through a maximum.
Abstract: Medium effects, my, of several electrolytes in acetonitrile and ethanol-water solvents were calculated from new and literature data. In ethanol-water solvents, medium effects for single ions were estimated using the three assumptions that the values of log my of tetraphenylarsonium tetraphenylborate, tetraphenylphosphonium tetraphenylborate, and triisoamyl-n-butylammonium tetraphenylborate, respectively, can be divided equally between their anions and cations. In acetonitrile, only the first two assumptions were applied. Excellent agreement was observed between the first two assumptions, while the third deviated from them by up to0.5 unit in log my. According to all three estimates of the medium effects for the proton, the basicity of ethanol-water mixtures is greater than that of the pure solvents and passes through a maximum. For ethanol-water solvents, the liquid-junction potentials at their interfaces with aqueous KCI and the potentials of the standard hydrogen electrodes referred to the aqueous SHE were calculated.
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TL;DR: In this paper, the electrochemical behavior of chlorine and chloride solutions in acetonitrile at platinum electrodes has been studied, and the most likely mechanism and rate-determining step are postulated.
36 citations
TL;DR: The reactivity ratios for the free radical copolymerization at 60°C of methacrylonitrile (M1) and styrene have been determined in benzene, benzonitrile, acetonitrile and benzyl alcohol solutions as mentioned in this paper.
TL;DR: The temperature dependence of the rate of solvolysis of t-butyl chloride in mixtures of tetrahydrofuran and of acetonitrile in water was determined in this paper.
Abstract: The temperature dependence of the rate of solvolysis of t-butyl chloride in mixtures of tetrahydrofuran and of acetonitrile in water have been determined. In the high-water range both minor co-solv...
TL;DR: Tetrakistetramethylenedithiocarbamatometals M[S2CN(CH2)4]4(M = NbIV, MoIV, and WIV) have been prepared by reactions of ammonium tetramer methylenedithIocarbamate and the respective metal tetrachloride in acetonitrile.
Abstract: Tetrakistetramethylenedithiocarbamatometals M[S2CN(CH2)4]4(M = NbIV, MoIV, and WIV) have been prepared by reactions of ammonium tetramethylenedithiocarbamate and the respective metal tetrachloride in acetonitrile. The pentakis-compound Ta[S2CN(CH2)4]5 was also prepared. Spectroscopic (u.v., visible, and i.r.) and magnetic susceptibility studies were carried out on the compounds. The niobium, molybdenum, and tungsten compounds appear to be eight-co-ordinate.
TL;DR: Arylthallium(III) salts react with copper (II) or (I) cyanide in acetonitrile or pyridine to give the corresponding aryl cyanides in good yield as discussed by the authors.
TL;DR: In vivo and in vitro results imply a substrate site containing at least molybdenum and a close competition between acrylonitrile and H 3 O + for reducing equivalents, and are consistent with a substratum site containing both iron and moly bdenum.
TL;DR: In this article, photolysis of ethyl diazoacetate in the presence of benzophenone gave an oxazoline incorporating the eleme-means of the EDE.
Abstract: Photolysis of ethyl diazoacetate and of ethyl diazomalonate in acetonitrile gave oxazoles. Photolysis of ethyl diazoacetate in the presence of benzophenone gave an oxazoline incorporating the eleme...
TL;DR: In this article, a spectroscopic examination of acetonitrile solutions obtained by controlled-potential reduction of Eu3+ or Sm3+ was carried out, and it was found that up to the highest concentrations studied (∼01 M) the observed spectra were simply superpositions of those of the individual trivalent and divalent lanthanide ions, when care is taken in purifying the solvent.
TL;DR: In this article, the SCN − /(SCN) 2 system was studied on platinum in the temperature range from −12 to −3°C at different ammonium thiocyanate concentrations in acetonitrile in the presence of 0·1 M [(C 2 H 5 ) 4 N]ClO 4.
TL;DR: It is difficult at this time to make a final choice between the TAB BPh4 and the combined PhrAs B Ph4-Ph4P BPh 4 assumptions for the estimation of medium effects for single ions, but the latter tends to favor the latter on the grounds that for the solvents studied here, log mYPh& = log m YPh,P, which in turn makes the assumption of their equality to log mBph4 seem very plausible.
Abstract: able to evaluate the corresponding liquid-junction potentials (Table VII). While it is difficult at this time to make a final choice between the TAB BPh4 and the combined PhrAs BPh4-Ph4P BPh4 assumptions for the estimation of medium effects for single ions, we tend to favor the latter on the grounds that for the solvents studied here, log mYPh& = log mYPh,P, which in turn makes the assumption of their equality to log mYBph4 seem very plausible.
TL;DR: In this article, the effect of thiocyanate ion on the electrode reaction of nickel(II) in acetonitrile solution was investigated by d.c. polarography and controlled potential electrolysis.
TL;DR: The reaction between silicon tetrachloride and catechol in acetonitrile at 0° results in the formation of o-phenylenedioxydichlorosilane (I) and bis(o-phenylenedioxy)silane (III) as mentioned in this paper.
Abstract: The reaction between silicon tetrachloride and catechol in acetonitrile at 0° results in the formation of o-phenylenedioxydichlorosilane (I) and bis(o-phenylenedioxy)silane (III). The former compound exists both as a monomer-dimer mixture (I and II) and as the pure dimer (II). 2,2′-Biphenylenedioxy-bis(methoxy)silane (V) was also prepared and its facile conversion to bis(2,2′-biphenylenedioxy)silane (VI) was observed.
TL;DR: In this article, it was shown that in many cases this product ratio is not kinetically controlled and acid was concomitantly produced during oxidation and catalyzed the conversion of the alcohol to the acetamide.
TL;DR: In this article, the results of photochemical reduction of Fe 2 (phen) 4 OX 2 Y 2 (X − or Y − = Cl −, Br −, NCS −, ClO 4 − ) in aqueous and acetonitrile media is reported The products of the photochemical reaction are Fe(phen) 3 2+ and Fe 3+
TL;DR: The thermal decomposition of 1-alkyl-3-benzoyl-2-(m-nitrophenyl)aziridines in dry acetonitrile results in a series of autocatalytic hydrolytic cleavages, 1,3-dipolar additions, condensations, and r...
Abstract: The thermal decomposition of 1-alkyl-3-benzoyl-2-(m-nitrophenyl)aziridines in dry acetonitrile results in a series of autocatalytic hydrolytic cleavages, 1,3-dipolar additions, condensations, and r...
TL;DR: In this paper, the physical and chemical properties of several new sulfilimines, N-carbamoylsulfilimine, and their syntheses were studied, and the results were discussed.
Abstract: The physical and chemical properties of several new sulfilimines, N-carbamoylsulfilimines, and their syntheses were studied. The sulfilimines were prepared by the action of N-chlorourea on appropriate sulfides in acetonitrile, and their IR and NMR spectra were obtained. Thermolysis, hydrolysis and reactions with thiophenol and sodium nitrite were carried out and the results were discussed.