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A novel optically active double-layered bis-crown ether (–)-(S,S)-(7) with a diphenanthrylnaphthalene moiety as the chiral centre has been prepared, and examination of its chiral recognition behaviour showed that (–)-(S,S)-(7) has a high enantiomer selectivity for 1,6-diphenylhexamethylene-1,6-diamine.
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Yamamoto et al. (1987) studied this question.
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