Über Metallalkyl‐ und ‐aryl‐ Verbindungen, XXVII. Darstellung und Kristallstruktur von Bis(phenylethinyl)bis‐(N,N,N′,N′‐tetramethylethylendiamin)magnesium, Mg(CCPh)₂(tmeda)₂

Metal Alkyl and Aryl Compounds, XXVII. Preparation and Crystal structure of Bis(phenylethynyl)bis( N , N , N ′, N ′‐tetramethylethylenediamine)magnesium, Mg(CCPh) 2 (tmeda) 2 The title compound has been prepared from bis(phenylethynyl)magnesium and N , N , N ′, N ′‐tetramethylethylenediamine (tmeda) and investigated by X ‐ray diffraction methods (orthorhombic space group Cmcm , Z = 4 , 696 (reflections, R = 0.049). It represents a first example of an organomagnesium compound with octahedral coordination of the central atom. The phenylethynyl ligands are in trans position.