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The first calorimetric studies of ethyl p-tert-butylcalix[4]arene tetraacetate and alkali metal cations in acetonitrile and in methanol are reported; the results suggest that acetonitrile enters the hydrophobic cavity of the ligand producing a synergistic effect which makes the hydrophilic cavity better preorganised to interact with cations in this-reaction medium.
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Namor et al. (1991) studied this question.
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