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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 26, Number 11
BKCSDE 26(11)
November 20, 2005 

 
Title
Stoichiometric Effects. Correlation of the Rates of Solvolysis of Isopropenyl Chloroformate
Author
Zoon Ha Ryu*, Young Ho Lee, Yunghee Oh
Keywords
Solvolyses, Grunwald-Winstein correlation parameters, Stoichiometric effect, Isopropenyl chloroformate
Abstract
Solvolysis rates of isopropenyl chloroformate (3) in water, D2O, CH3OD and in aqueous methanol, ethanol, 2,2,2-trifluoroethanol (TFE), acetone, 1,4-dioxane as well as TFE-ethanol at 10 oC are reported. Additional kinetic data for pure water, pure ethanol and 80%(w/w) 2,2,2-trifuoroethanol (T)-water (W) at various temperatures are also reported. These rates show the phenomena of maximum rates in specific solvents (30% (v/v) methanol-water and 20% (v/v) ethanol-water) and, variations in relative rates are small in aqueous alcohols. The kinetic data are analyzed in terms of GW correlations, steric effects, kinetic solvent isotope effects (KSIE), and a third order model based on general base catalysis (GBC). Solvolyses based on predominately stoichiometric solvation effect relative to medium solvation are proceeding in 3 and the results are remarkably similar to those for p-nitrobenzoyl chloride (4) in mechanism and reactivity.
Page
1761 - 1766
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