Adducts of macrocyclic polyethers (crown ethers) and aminopolyethers1,2 having hydrogen bonds with polar organic molecules, especially with CH-acidic compounds, are described. These can be isolated as solids, and are, as a rule, stoichiometrically consistent. The chemical shift of the 1H NMR signals of the adducts of malononitrile with various crown ethers corresponds to the anionic reactivity of potassium complexes of the crown ethers in the course of nucleophilic substitution reactions.
Die Struktur des Adduktes 2 Malononitril · 18‐Krone‐6 wurde röntgenographisch bestimmt und bis zu einem R‐Faktor von 0.049 verfeinert. Die Verbindung kristallisiert in der Raumgruppe P21/c. Die Malononitrilmoleküle bilden über CH · · · ·O‐Wasserstoffbrücken mit dem Kronenether analog den bicyclischen Aminopolyethern einen dreidimensionalen Hohlraum von ca. 100 pm Durchmesser. Der Kronenether hat wie im KSCN‐Komplex annähernd D3d‐Symmetrie.
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