Synthesen mit Nitrilen, LXXVIII. Untersuchungen zur Struktur der Dimeren des Malononitrils, Cyanessigesters und Cyanacetamids

Syntheses with Nitriles, LXXVIII. – Studies on the Structure of Dimers of Malononitrile, Cyanoacetate, and Cyanoacetamide The 13C‐ and 15N‐NMR data of dimers and codimers of malononitrile, cyanoacetate, and cyanoacetamide 1–6 are discussed In the case of the unsymmetrically substituted derivatives 2, 4 and 5 it is possible to distinguish between E‐ and the predominantly existing Z‐isomers. In the case of 2 the structure is confirmed by X‐ray structure analysis.