Synthesis of new macrocyclic ligands for hetero-multinuclear transition-metal complexes

Wilhelm T.S. Huck, Frank C.J.M. van Veggel, David N. Reinhoudt

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    The [3 + 3] macrocyclic compounds 2a–2c were easily prepared by cyclization of the dialdehyde 8 with the appropiate diamines in refluxing CH3CN/MeOH (1/1), in the presence of Ba2+ as a template ion. These macrocycles contain three salen units and are therefore, in combination with the crown ether interior, potentially tetranucleating. The length of the diamine bridge and the temperature at which the reaction is carried out, appear to influence the size of the macrocycle formed. In this way, the [4 + 4] macrocycle 2d could be formed selectively over the [3 + 3] macrocycles by carrying out the reaction at room temperature.
    Original languageEnglish
    Pages (from-to)273-276
    Number of pages4
    JournalRecueil des travaux chimiques des Pays-Bas
    Issue number6
    Publication statusPublished - 1995

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