A series of calix (aza‐)crowns 6a‐f and 11a,b has been prepared by reaction of either calix dimethyl ester 4 or calix diacid dichloride 10 with an appropriate diamine. The complexation with both di‐ and trivalent cations has been qualitatively studied using fast‐atom bombardment mass spectrometry.
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Ostaszewski et al. (1991) studied this question.
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