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http://dx.doi.org/10.5012/bkcs.2007.28.12.2377

Limitations of the Transition State Variation Model. Part 8. Dual Reaction Channels for Solvolyses of 3,4-Dimethoxybenzenesulfonyl Chloride  

Koo, In-Sun (Department of Chemistry Education and The Research Institute of Natural Science, Gyeongsang National University)
Kwon, Eun-Ju (Department of Chemistry Education and The Research Institute of Natural Science, Gyeongsang National University)
Choi, Ho-June (Department of Chemistry, Gyeongsang National University)
Yang, Ki-Yull (Department of Chemistry Education and The Research Institute of Natural Science, Gyeongsang National University)
Park, Jong-Keun (Department of Chemistry Education and The Research Institute of Natural Science, Gyeongsang National University)
Lee, Jong-Pal (Department of Chemistry, Dong-A University)
Lee, Ikc-Hoon (Department of Chemistry, Inha University)
Bentley, T. William (Department of Chemistry, University of Wales)
Publication Information
Bulletin of the Korean Chemical Society / v.28, no.12, 2007 , pp. 2377-2381 More about this Journal
Abstract
Solvolyses of 3,4-dimethoxybenzenesulfonyl chloride (DSC) in water, D2O, CH3OD, and in aqueous binary mixtures of acetone, acetonitrile, 1,4-dioxane, ethanol, methanol, and 2,2,2-trifluoroethanol (TFE) have been investigated at 25.0 oC. Kinetic solvent isotope effects (KSIE) in water and in methanol and product selectivities in alcohol-water mixtures are also reported. The Grunwald-Winstein plot of first-order rate constants for the solvolyic reaction of DSC with YCl shows marked dispersions into separated lines for various aqueous mixtures. With use of the extended Grunwald-Winstein equation, the l and m values obtained are 1.12 and 0.58 respectively for the solvolyses of DSC. The relatively large magnitude of l is consistent with substantial nucleophilic solvent assistance. From Grunwald-Winstein plots the rate data are dissected approximately into contributions from two competing reaction channels. This interpretation is supported for alcohol-water mixtures by the trends of product selectivities, which show a maximum for ethanol-water mixtures. From the KSIE of 1.45 in methanol, it is proposed that the reaction channel favored in methanolwater mixtures and in all less polar media is general-base catalysed and/or is possibly (but less likely) an addition-elimination pathway. Also, the KISE value of 1.35 for DSC in water is expected for SN2-SN1 processes, with minimal general base catalysis, and this mechanism is proposed for solvolyses in the most polar media.
Keywords
Solvolyses; Kinetic solvent isotope effect; General-base catalysis; Dual reaction channels;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
Times Cited By Web Of Science : 11  (Related Records In Web of Science)
Times Cited By SCOPUS : 2
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