The reaction of p-nitrophenyl acetate with butane-2,3-dione monoximate anion as the α-nucleophile, compared with p-chlorophenoxide ion as the normal nucleophile, exhibits a maximum in rate enhancement (‘α-effect’) in dimethyl sulphoxide–water mixtures as the medium composition is varied.
E. Buncel and I. Um, J. Chem. Soc., Chem. Commun., 1986, 595 DOI: 10.1039/C39860000595
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