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Zusammenfassung
We report a concise method for the preparation of 1,4,7,10-tetra-N-alkyl-1,4,7,10-tetraaza-cyclododecanes via deprotonation to the fourfold lithium amide followed by alkylation with alkyl bromides. The procedure circumvents the problem of ammonium salt formation and provides direct access to hydrophobic 1,4,7,10-tetraaza-cyclododecanes in moderate yield. The so obtained hydrophobic macrocycles ...
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