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

Abstract The reactions of Ni(cod) 2 (cod  1,5-cyclooctadiene), Ni(cdt) (cdt  trans , trans , trans -1,5,9-cyclododecatriene), and Ni(C 2 H 4 ) 3 with N , N , N ′, N ′-tetramethyl-ethylenediamine (tmeda) and tetrafluoroethene in ether yield almost quantitatively yellow needles of (tmeda)Ni(C 2 F 4 ) ( 1 ). 1 can also be obtained from the reaction of Ni(η 3 -C 3 H 5 ) 2 /tmeda or (tmeda)Ni(CH 3 ) 2 with C 2 F 4 . 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 C 2 F 4 ligands. 1 reacts slowly with ethyne at 20°C to afford red-brown crystals of the nickelacyclopentene derivative (tmeda)Ni(CHCHC 2 F 4 ) ( 2 ).