Tmeda-Nickel-Komplexe: IV. Synthese und Struktur von (tmeda)Ni(H 2CCHCOOCH 3) 2

Abstract

Ni(C 2H 4) 3, Ni(cdt), or Ni(cod) 2 react with tmeda and acrylic acid methyl ester, methyl vinyl ether, and acrylonitrile in ether to afford (tmeda)Ni(H 2CCHCOOCH 3) 2 ( 3, orange-red crystals), (tmeda)Ni(H 2CCHCOCH 3) 2 ( 4, red crystals), and (tmeda)Ni(H 2CCHCN) 2 ( 5, yellow precipitate) in up to 90% yield. These complexes are also formed by interaction of the homoleptic bis(alkene) nickel(0) complexes Ni(H 2CCHCOOCH 3 2, Ni(H 2CCHCOCH 3 2, and Ni(H 2CCHCN) 2 with tmeda, and by the reaction of (tmeda)Ni(CH 3) 2 with the alkenes in ether at −30°C or above, under reductive elimination of ethane. Solid 3 is stable to about 110°C, whereas 4 decomposes slowly at 20°C; decomposition of 5 occurs at 136°C. The IR, 1H and 13C NMR spectra are reported. In addition, 3 has been characterized by an X-ray diffraction study.