Methylnickel compounds containing 2-phosphinylethanolato ligands – Syntheses, properties, and ethene coupling reactions
作者:Hans-Friedrich Klein、Mengzhen He、Olaf Hetche、Alexander Rau、Dirk Walther、Thomas Wieczorek、Gerhard Luft
DOI:10.1016/j.ica.2005.07.030
日期:2005.11
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 O C(R1R2), the dimethylphosphinylethanols HO(R1R2)CCH2PMe2 (3: R1R2 = 9-fluorenyl; 4: R1 = H, R2 = C6H5) were synthesized as prechelate ligands. Under
摘要将二甲基次膦基乙醇HO(R1R2)CCH2PMe2(1:R1 = R2 = C6H5; 2:R1 = R2 = 4-OMe–C6H4; 5:R1 = R2 = 4-NMe2-C6H4)与甲基(甲氧基)(三甲基膦)镍结合得到单核甲基(三甲基膦)镍(螯合物)化合物7-9。配体6(R1 = Me,R2 = 4-OMe–C6H5)得到双核甲基镍化合物14。通过使(TMEDA)锂-二甲基膦基甲甲烷与酮OC(R1R2)反应,二甲基膦基乙醇HO(R1R2)CCH2PMe2(3:R1R2 = 9 -芴基; 4:R 1 = H,R 2 = C 6 H 5)被合成为前螯合物。在其他相似的条件下,3中的芴基取代的阴离子会生成单核络合物10,发现该化合物可作为形成三核膦的双核11的来源,同时也可作为形成五配位的10·PMe3的三甲基膦的受体。Ni(COD)(PMe3)2在将8或9分别转化为双核甲基镍化合物12