Results 81 to 90 of about 229 (107)
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ChemInform, 1987
AbstractResults of a reinvestigation of the anodically initiated chain reaction of Ph2CN2 in dry MeCN or in solvents containing H2O or MeOH lead to the suggestion that H+ is the chain carrier.
J. M. BAKKE, D. BETHELL, V. D. PARKER
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AbstractResults of a reinvestigation of the anodically initiated chain reaction of Ph2CN2 in dry MeCN or in solvents containing H2O or MeOH lead to the suggestion that H+ is the chain carrier.
J. M. BAKKE, D. BETHELL, V. D. PARKER
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J. Chem. Soc., Perkin Trans. 2, 1993
The reactivities of 2-substituted cyclohex-1-enecarboxylic acids with diazodiphenylmethane in several alcohols were investigated. The rate data for these acids were correlated with a simple Hammett equation by means of the σp constants. The transmission of polar effects through the double bond, in terms of polar susceptibility constant ρ, has been ...
Gordana S. Ušćumlić +2 more
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The reactivities of 2-substituted cyclohex-1-enecarboxylic acids with diazodiphenylmethane in several alcohols were investigated. The rate data for these acids were correlated with a simple Hammett equation by means of the σp constants. The transmission of polar effects through the double bond, in terms of polar susceptibility constant ρ, has been ...
Gordana S. Ušćumlić +2 more
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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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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
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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
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ChemInform, 1995
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
G. S. USCUMLIC, M. D. MUSKATIROVIC
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AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
G. S. USCUMLIC, M. D. MUSKATIROVIC
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Chemischer Informationsdienst, 1982
AbstractWährend die Thermolyse der Titelverbindung (I) in O2‐ gesättigtem Lösungsmittel zu Benzophenon (II) (Ausb. 70%) und dem Azin (III) (30%) führt, wird bei einem Zusatz von S‐Verbindungen wie z.B. 1,2,3‐Benzothiadiazol (BTD) oder Dibenzylsulfid (DBS), der die Reaktion mit steigender Konzentration zunehmend beschleunigt, hauptsächlich das Ethylen ...
L. BENATI +2 more
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AbstractWährend die Thermolyse der Titelverbindung (I) in O2‐ gesättigtem Lösungsmittel zu Benzophenon (II) (Ausb. 70%) und dem Azin (III) (30%) führt, wird bei einem Zusatz von S‐Verbindungen wie z.B. 1,2,3‐Benzothiadiazol (BTD) oder Dibenzylsulfid (DBS), der die Reaktion mit steigender Konzentration zunehmend beschleunigt, hauptsächlich das Ethylen ...
L. BENATI +2 more
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Journal of the Chemical Society, Perkin Transactions 2, 1978
The kinetics of the reactions of meta- and para-substituted diazodiphenylmethanes (DDM) with tetracyanoethylene (TCNE) in benzene are reported. The corresponding 1,1-diaryl-2,2,3,3-tetracyanocyclopropanes were produced almost quantitatively and the second-order rate constants k increased with the electron-donating ability of the substituents; the ...
Takumi Oshima +2 more
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The kinetics of the reactions of meta- and para-substituted diazodiphenylmethanes (DDM) with tetracyanoethylene (TCNE) in benzene are reported. The corresponding 1,1-diaryl-2,2,3,3-tetracyanocyclopropanes were produced almost quantitatively and the second-order rate constants k increased with the electron-donating ability of the substituents; the ...
Takumi Oshima +2 more
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International Journal of Chemical Kinetics, 2013
ABSTRACTThe kinetics of the reaction of benzoic, 2‐methylbenzoic, phenylacetic, cyclohex‐1‐enecarboxylic, 2‐methylcyclohex‐1‐enecarboxylic, and cyclohex‐1‐eneacetic acids with diazodiphenylmethane was studied at 30, 33, 37, 40, and 45°C in a set of 12 protic and aprotic solvents. The reactions were found to follow the second‐order kinetics.
Nikolić, Jasmina, Ušćumlić, Gordana
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ABSTRACTThe kinetics of the reaction of benzoic, 2‐methylbenzoic, phenylacetic, cyclohex‐1‐enecarboxylic, 2‐methylcyclohex‐1‐enecarboxylic, and cyclohex‐1‐eneacetic acids with diazodiphenylmethane was studied at 30, 33, 37, 40, and 45°C in a set of 12 protic and aprotic solvents. The reactions were found to follow the second‐order kinetics.
Nikolić, Jasmina, Ušćumlić, Gordana
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J. Chem. Soc., Perkin Trans. 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
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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
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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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