Steric effects in the reaction of alkyl-phenyl and dialkyl-sulphides with chloramine-T |
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Authors: | Ferenc Ruff Kazuhiko Komoto Naomichi Furukawa Shigeru Oae |
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Affiliation: | Department of Applied Chemistry, Faculty of Engineering, Osaka City University, Sugimoto-cho, Sumiyoshi-ku, Osaka, Japan |
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Abstract: | The rate of the reaction of dialkyl- and alkyl-phenyl-sulphides with TsNHCl increases with the increasing +I effect of the S-substituents, while the steric effect is only of minor importance. Rate constants of the reaction of dialkyl sulphides can be correlated with the Taft equation (?* = ?1.96, δ = 0.285). The effect of ring size of cyclic sulphides on the reaction is discussed. The change of the rate constants with varying S-alkyl substituents is in agreement with a sterically unhindered electrophilic addition of Cl+ on bivalent sulphur, leading to chlorosulphonium ion. Sulphimides and sulphoxides are formed from the chlorosulphonium intermediates in the subsequent SN-type reactions with different steric control. |
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