Multiple (amine + aldehyde) condensation gives the macrobicyclic cryptands (1) and (3) in high yield; (1) gave a dinuclear CuI cryptate and was reduced to a polyamine (2) which binds anions, when protonated.
J. Jazwinski, J. Lehn, D. Lilienbaum, R. Ziessel, J. Guilhem and C. Pascard, J. Chem. Soc., Chem. Commun., 1987, 1691 DOI: 10.1039/C39870001691
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