874130-87-7Relevant academic research and scientific papers
Methylnickel compounds containing 2-phosphinylethanolato ligands - Syntheses, properties, and ethene coupling reactions
Klein, Hans-Friedrich,He, Mengzhen,Hetche, Olaf,Rau, Alexander,Walther, Dirk,Wieczorek, Thomas,Luft, Gerhard
, p. 4394 - 4402 (2005)
Combining dimethylphosphinylethanols HO(R1R2)CCH 2PMe2 (1: R1 = R2 = C 6H5; 2: R1 = R2 = 4-OMe-C 6H4; 5: R1 = R2 = 4-NMe 2-C6H4) with methyl(methoxo) (trimethylphosphine)nickel gave mononuclear methyl(trimethylphosphine) nickel(chelate) compounds 7-9. Ligand 6 (R1 = Me, R2 = 4-OMe-C6H5) afforded a dinuclear methylnickel compound 14. By reacting (TMEDA)lithium-dimethylphosphinylmethanide with ketones OC(R 1R2), the dimethylphosphinylethanols HO(R 1R2)CCH2PMe2 (3: R1R 2 = 9-fluorenyl; 4: R1 = H, R2 = C 6H5) were synthesized as prechelate ligands. Under otherwise similar conditions, the fluorenyl substituted anion in 3 gave rise to a mononuclear complex 10 which was found to act as a source of trimethylphosphine forming dinuclear 11 and at the same time to act as an acceptor of trimethylphosphine forming pentacoordinate 10·PMe 3. Ni(COD)(PMe3)2 was used as a scavenger of PMe3 in converting 8 or 9 to the dinuclear methylnickel compounds 12 and 13, respectively. Modifying the P,O chelating unit of a methyl nickel compound by introducing 2-phosphinylethanolato ligands leads to novel single-component catalysts for ethene oligomerization showing moderate reactivity and thermal stability.
