Results 71 to 80 of about 221 (105)
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Journal of the Chemical Society, Perkin Transactions 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
exaly +2 more sources
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
exaly +2 more sources
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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Journal of the Chemical Society, Perkin Transactions 2, 1994
The reactivities of 2-substituted cyclohex-1-enylacetic acids with diazodiphenylmethane in eleven alcohols has been investigated. The solvent effect is interpreted in terms of the influence of the relative permittivity on the rate constants. The multiple linear correlation of log k with the Kirkwood function of relative permittivity, Taft σ* value for ...
Gordana S Ušćumlić
exaly +2 more sources
The reactivities of 2-substituted cyclohex-1-enylacetic acids with diazodiphenylmethane in eleven alcohols has been investigated. The solvent effect is interpreted in terms of the influence of the relative permittivity on the rate constants. The multiple linear correlation of log k with the Kirkwood function of relative permittivity, Taft σ* value for ...
Gordana S Ušćumlić
exaly +2 more sources
Helvetica Chimica Acta, 2008
AbstractDiazodiphenylmethane (DDM) undergoes cycloadditions to 1‐substituted buta‐1,3‐dienes exclusively at the C(3)C(4) bond. At room temperature, the N2 loss from the initially formed 4,5‐dihydro‐3H‐pyrazoles 2 is faster than the cycloaddition and furnishes the vinylcyclopropane derivatives 7 and 9 with structural retention at the C(1)C(2) bond.
Akihiro Ohta +4 more
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AbstractDiazodiphenylmethane (DDM) undergoes cycloadditions to 1‐substituted buta‐1,3‐dienes exclusively at the C(3)C(4) bond. At room temperature, the N2 loss from the initially formed 4,5‐dihydro‐3H‐pyrazoles 2 is faster than the cycloaddition and furnishes the vinylcyclopropane derivatives 7 and 9 with structural retention at the C(1)C(2) bond.
Akihiro Ohta +4 more
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Carbohydrate Research, 2001
A kinetic study of the tin(II) chloride catalyzed reaction of diazodiphenylmethane with ethylene glycol in dimethoxyethane is reported. The preparation and characterization of ethylene glycol monodiphenylmethyl ether, the main product from this reaction, is also reported as well as the preparation of the two diphenylmethyl monoethers of methyl 4,6-O ...
Sigthor Petursson
exaly +3 more sources
A kinetic study of the tin(II) chloride catalyzed reaction of diazodiphenylmethane with ethylene glycol in dimethoxyethane is reported. The preparation and characterization of ethylene glycol monodiphenylmethyl ether, the main product from this reaction, is also reported as well as the preparation of the two diphenylmethyl monoethers of methyl 4,6-O ...
Sigthor Petursson
exaly +3 more sources
Bulletin of the Chemical Society of Japan, 1983
Abstract A high pressure kinetic study was made of the 1,3-dipolar cycloaddition reaction of Ph2CN2 with dimethyl maleate (DMM), dimethyl fumarate (DMF), methyl acrylate (MA), maleonitrile (MN), fumaronitrile (FN), and acrylonitrile (AN) in toluene at 25 °C. The activation volumes (ΔV\eweq) at 1 bar obtained for DMM, DMF, MA, MN, FN, and
Yosuke Yoshimura +2 more
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Abstract A high pressure kinetic study was made of the 1,3-dipolar cycloaddition reaction of Ph2CN2 with dimethyl maleate (DMM), dimethyl fumarate (DMF), methyl acrylate (MA), maleonitrile (MN), fumaronitrile (FN), and acrylonitrile (AN) in toluene at 25 °C. The activation volumes (ΔV\eweq) at 1 bar obtained for DMM, DMF, MA, MN, FN, and
Yosuke Yoshimura +2 more
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Ring-Chain Tautomerism. Part 10. The Reaction of Oxocarboxylic Acids with Diazodiphenylmethane
Collection of Czechoslovak Chemical Communications, 1999The rate coefficients for the esterification of a series of oxocarboxylic acids with diazodiphenylmethane have been determined in ethanol or 2-methoxyethanol at 30.0 °C. These and the rates of reaction with model compounds have been used to estimate the equilibrium constants for ring-chain tautomerism for the oxocarboxylic acids.
Keith Bowden +2 more
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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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The Reactivity of 2-(4-Phenylsubstituted)-α,β-Unsaturated Carboxylic Acids with Diazodiphenylmethane
QSAR and Combinatorial Science, 1991AbstractIn connection with a study of the transmission of polar effects through ring double bonds, double bonds in open chain systems and delocalized double bonds, the reactivity of 2‐(4‐phenylsubstituted)‐α,β‐unsaturated carboxylic acids with diazodiphenylmethane in ethanol was investigated.
Gordana S. Ušćaumlića +2 more
exaly +2 more sources
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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