Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 116, Issue 1, Pages 55-60Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molliq.2004.06.003
Keywords
hydroxamate ions; solvent effect; SN2 reaction; alpha-effect
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Rate constants have been measured spectrophotometrically for the reactions of p-nitrophenyl acetate (PNPA) with some alpha-effect nucleophiles, i.e., acetohydroxamate, benzohydroxamate, and salicylhydroxamate ions in dimethylsulfoxide, dimethylformamide, 1,4-dioxane, and acetonitrile-water mixtures of varying compositions (10-80% v/v) at 27 degreesC (pH 7.7). All the three hydroxamates exert a large alpha-effect in H2O. The reactivity of hydroxamates towards PNPA depends upon the nature of substrate and solvents. The kinetic results have been explained on the basis of basicities (pK(a)), solvation effect, alpha-effect, and ground state destabilization. (C) 2004 Elsevier B.V. All rights reserved.
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