In the extraction of alkaline earth cations by acidic organophosphorus extractants, a correlation has been demonstrated between the effectiveness of the stereoisomers of dicyclohexano-18-crown-6 as synergists and the strain energy associated with conversion of the unbound crown ether to its complexed form.
M. L. Dietz, A. H. Bond, R. Chiarizia, V. J. Huber, A. W. Herlinger and B. P. Hay, Chem. Commun., 1999, 1177 DOI: 10.1039/A902842K
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