Alkaliisocyanacetate. Synthese und Struktur von [K(18‐Krone‐6)](O 2 CCH 2 NC)

Alkali‐isocyanoacetates. Synthesis and Structure of [K(18‐crown‐6)](O 2 CCH 2 NC) The alkali isocyanoacetates M + [O 2 CCH 2 NC] − (M = Li,Na,K,Cs) ( 1a ‐ d ) are synthesized by reaction of ethyl isocyanoacetate with the respective alkali hydroxides in ethanol and characterized by IR, NMR ( 1 H, 13 C), and mass spectrometry (FAB). In alcoholic solution as well as in the gas phase ion pairs and higher aggregated species are observed. In contrast, [K(18‐crown‐6)][O 2 CCH 2 NC] ( 2 ) which is obtained from 1c and 18‐crown‐6, turns out to be a 1:1 electrolyte in solution (acetone); in the solid, the isocyanoacetate anion binds to K + via the two carboxylate oxygen atoms resulting in an O 8 ‐coordinated metal atom.