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Distribution of six β-diketones between hexane, benzene, carbon tetrachloride, or chloroform and 0.1 mol dm−3 aqueous perchlorate solutions has been measured in the presence of trioctylphosphine oxide (TOPO). The distribution ratio was, in many cases, enhanced by TOPO; this was explained in terms of association of the β-diketones and TOPO. The association constants were greater when the β-diketone was stronger as an acid and also in the following order of the diluent: CHCl3
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Sekine et al. (1983) studied this question.
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