Zobrazeno 1 - 10 of 13 pro vyhledávání: '"E. C. F. Ko"'
1
Studies on the Decomposition of Tetra-alkylammonium Salts in Solution. V. Rates and Activation Parameters of Salts Containing Substituted-benzyl or Other Active Groups
Autor: K. T. Leffek, E. C. F. Ko
Publikováno v: Canadian Journal of Chemistry. 50:1297-1302
First order rate constants and activation parameters are reported for the decomposition in chloroform and acetone solvents of a series of 4-substituted-benzylphenyldimethylammonium bromides and iodides and also of a series of tetra-alkylammonium brom
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::516d6a52233d7ae1fbc4e9254c88efb5
https://doi.org/10.1139/v72-203
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2
Studies on the Decomposition of Tetra-alkylammonium Salts in Solution. IV. The α-Deuterium Secondary Isotope Effect
Autor: E. C. F. Ko, K. T. Leffek
Publikováno v: Canadian Journal of Chemistry. 49:129-132
The secondary deuterium isotope effect is reported for the decomposition of benzyl-α-d2-phenyldimethylammonium bromide in both chloroform and acetone solvent, over a temperature range of 25 to 30°. The magnitudes of the rate ratios are compared to
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f7515abd2557d62da4db4cd63bc06f8b
https://doi.org/10.1139/v71-019
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3
The Mechanism for Hydrolysis of Primary Alkyl Chlorosulfates in Water. The Kinetic Solvent Isotope Effect and the Secondary Deuterium Isotope Effect
Autor: R. E. Robertson, E. C. F. Ko
Publikováno v: Canadian Journal of Chemistry. 50:434-437
The temperature coefficients of the enthalpy of activation [Formula: see text] for the hydrolysis of the three chlorosulfates, methyl, ethyl, and β-chloro, are shown to have values of −50,−55, and −60 cal deg−1 mol−1; values in the same ra
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2e265c3b24fe57902e79caf6f180c1e7
https://doi.org/10.1139/v72-063
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5
Studies on the decomposition of tetra-alkylammonium salts in solution. Part III: Interpretation of Hammett correlations
Autor: E. C. F. Ko, K. T. Leffek
Publikováno v: Canadian Journal of Chemistry. 48:1865-1868
Hammett free energy correlations are reported for the decomposition reactions of tetra-alkylammonium halides in chloroform and acetone solution. All the salts contained a substituted benzyl group attached to the nitrogen atom and decomposed to yield
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fef9c20a4d495d11ed070a374d344898
https://doi.org/10.1139/v70-307
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6
Hydrolysis of Sulfamoyl Chlorides. II. Hydrogen Participation in the Hydrolysis of Diethyl and Methylethylsulfamoyl Chlorides
Autor: R. E. Robertson, E. C. F. Ko
Publikováno v: Canadian Journal of Chemistry. 50:946-951
Diethylsulfamoyl chloride (2) hydrolyzes eight times faster than dimethylsulfamoyl chloride (1). In 2 the secondary deuterium isotope effect was found to be about 2, hence hydrogen participation is important in the hydrolysis of this compound. The te
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a71fc2ebcdaeff0946b641786cdb8f19
https://doi.org/10.1139/v72-146
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