Results 81 to 90 of about 221 (105)
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Chemischer Informationsdienst, 1979
AbstractDie Geschwindigkeitskonstanten 2. Ordnung für die Titelreaktion nehmen mit der Donatorfähigkeit der Substituenten in den Diazomethanen (I) zu.
T. OSHIMA, A. YOSHIOKA, T. NAGAI
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AbstractDie Geschwindigkeitskonstanten 2. Ordnung für die Titelreaktion nehmen mit der Donatorfähigkeit der Substituenten in den Diazomethanen (I) zu.
T. OSHIMA, A. YOSHIOKA, T. NAGAI
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Journal of the Chemical Society, Perkin Transactions 1, 1975
Diazodiphenylmethane has been prepared from benzophenone hydrazone by oxidation with peracetic acid in the presence of a base and a trace of iodine. Two variants of the process are described: (a) benzophenone hydrazone in an organic solvent is oxidised with peracetic acid in the presence of 1,1,3,3-tetramethylguanidine and a trace of iodine; (b) a ...
J. Robert Adamson +5 more
exaly +2 more sources
Diazodiphenylmethane has been prepared from benzophenone hydrazone by oxidation with peracetic acid in the presence of a base and a trace of iodine. Two variants of the process are described: (a) benzophenone hydrazone in an organic solvent is oxidised with peracetic acid in the presence of 1,1,3,3-tetramethylguanidine and a trace of iodine; (b) a ...
J. Robert Adamson +5 more
exaly +2 more sources
Journal of the Chemical Society, Perkin Transactions 2, 1974
The empirical Hammett treatment has been applied to the investigation of structure–reactivity relationships for pyridine and pyridine N-oxide carboxylic acids in the reaction with diazodiphenylmethane. The values obtained for the pyridine aza-group (σ2 0·878, σ3 0·740, σ41·105) are in good agreement with the literature values for the alkaline ...
Djordje M. Dimitrijević +3 more
exaly +2 more sources
The empirical Hammett treatment has been applied to the investigation of structure–reactivity relationships for pyridine and pyridine N-oxide carboxylic acids in the reaction with diazodiphenylmethane. The values obtained for the pyridine aza-group (σ2 0·878, σ3 0·740, σ41·105) are in good agreement with the literature values for the alkaline ...
Djordje M. Dimitrijević +3 more
exaly +2 more sources
Chemischer Informationsdienst, 1976
AbstractDurch Oxidation der Hydrazone (I) mit Peressigsäure in Gegenwart von Tetramethylguanidin (TMG) als Base und einer Spur Jod in einem organischen Lösungsmittel (Methode A) werden die Diazomethanderivate (II) dargestellt.
J. ROBERT ADAMSON +5 more
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AbstractDurch Oxidation der Hydrazone (I) mit Peressigsäure in Gegenwart von Tetramethylguanidin (TMG) als Base und einer Spur Jod in einem organischen Lösungsmittel (Methode A) werden die Diazomethanderivate (II) dargestellt.
J. ROBERT ADAMSON +5 more
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Canadian Journal of Chemistry, 1966
The rate coefficients for the reaction with diazodiphenylmethane, in ethanol at 30.0°, of a number of substituted indole-2-carboxylic acids, indole-3-carboxylic acids, coumarin-3-carboxylic acids, coumarilic acids, and N-phenylglycines have been determined.
Keith Bowden, D. C. Parkin
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The rate coefficients for the reaction with diazodiphenylmethane, in ethanol at 30.0°, of a number of substituted indole-2-carboxylic acids, indole-3-carboxylic acids, coumarin-3-carboxylic acids, coumarilic acids, and N-phenylglycines have been determined.
Keith Bowden, D. C. Parkin
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Journal of the Chemical Society, Perkin Transactions 2, 1982
Rate constants have been determined for the reactions at 30, 35, and 40 °C of diazodiphenylmethane with 4′-substituted biphenyl-4-carboxylic acids and 4-substituted 1-naphthoic acids in 14 alcohols. Hammett ρ values have been evaluated for the reactions in 11 of the alcohols.
P. Ananthakrishnanadar +2 more
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Rate constants have been determined for the reactions at 30, 35, and 40 °C of diazodiphenylmethane with 4′-substituted biphenyl-4-carboxylic acids and 4-substituted 1-naphthoic acids in 14 alcohols. Hammett ρ values have been evaluated for the reactions in 11 of the alcohols.
P. Ananthakrishnanadar +2 more
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Canadian Journal of Chemistry, 1964
Rate coefficients have been determined for the reactions in ethanol at 30° of diazodiphenylmethane with several groups of carboxylic acids. Each group included the parent acid and three nuclear substituted acids. The parent acids were: benzoic, phenylacetic, β-phenylpropionic, phenoxyacetic, and trans-cinnamic acid.
K. Bowden, N. B. Chapman, J. Shorter
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Rate coefficients have been determined for the reactions in ethanol at 30° of diazodiphenylmethane with several groups of carboxylic acids. Each group included the parent acid and three nuclear substituted acids. The parent acids were: benzoic, phenylacetic, β-phenylpropionic, phenoxyacetic, and trans-cinnamic acid.
K. Bowden, N. B. Chapman, J. Shorter
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Reaction mechanisms of peroxybenzoic acid toward diazodiphenylmethanes
The Journal of Organic Chemistry, 1971Ruggero Curci +2 more
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Canadian Journal of Chemistry, 1965
The rate coefficients for the reaction with diazodiphenylmethane in ethanol, t-butyl alcohol, and ethyl acetate at 30° and the pKa values in water at 25° of fourteen 3-substituted acrylic acids have been determined. The effect of substitution is assessed by use of linear free energy relations.
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The rate coefficients for the reaction with diazodiphenylmethane in ethanol, t-butyl alcohol, and ethyl acetate at 30° and the pKa values in water at 25° of fourteen 3-substituted acrylic acids have been determined. The effect of substitution is assessed by use of linear free energy relations.
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Chemischer Informationsdienst, 1975
AbstractZahlreiche Cärbonsäuren (I) werden mit Diphenyldiazomethan (II) umgesetzt.
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AbstractZahlreiche Cärbonsäuren (I) werden mit Diphenyldiazomethan (II) umgesetzt.
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