Amin—Nickel-Komplexe VI. Synthese, Struktur und Reaktivität von (tmeda)Ni(C2F4)

The reactions of Ni(cod)2 (cod  1,5-cyclooctadiene), Ni(cdt) (cdt  trans,trans, trans-1,5,9-cyclododecatriene), and Ni(C2H4)3 with N,N,N′,N′-tetramethyl-ethylenediamine (tmeda) and tetrafluoroethene in ether yield almost quantitatively yellow needles of (tmeda)Ni(C2F4) (1). 1 can also be obtained from the reaction of Ni(η3-C3H5)2/tmeda or (tmeda)Ni(CH3)2 with C2F4. An X-ray diffraction study of the crystal structure of 1 confirms the trigonal-planar (or pseudo-square-planar) coordination of nickel by the tmeda and C2F4 ligands. 1 reacts slowly with ethyne at 20°C to afford red-brown crystals of the nickelacyclopentene derivative (tmeda)Ni(CHCHC2F4) (2).