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Platinum(II) ion, in the presence of platinum(IV), is found to catalyse the hydroxylation of unactivated C–H bonds of aliphatic carboxylic acids in water with the following order of reactivity: α-C–H << β-C–H < γ-C–H δ-C–H ≈ε-C–H.
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Kao et al. (1991) studied this question.
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