New homoleptic nickel(0) and palladium(0) complexes with a water-soluble ligand, 1,3,5-triaza-7-phosphaadamantane, were prepared and characterized by 1H, 13C, and 31P NMR spectra. The complexes, together with the known analogous Ni(0) and Pd(0) complexes with tris(hydroxymethyl)phosphine, were found to be catalysts for buta-1,3-diene oligomerization or telomerization with water in an aqueous biphasic system without a cosolvent or a modifier. Tetrakis[tris(hydroxymethyl)phosphine]nickel (7) preferentially catalyzes oligomerization (both linear and cyclic) in the first example of a nickel-catalyzed buta-1,3-diene oligomerization in an aqueous biphasic system. Palladium complexes give telomers or linear oligomers in quantitative yields. In the case of the triazaphosphaadamantane complex 4, high selectivity to octadienyl ethers (87%) was observed. High values of metal leaching into the product phase in these reactions suggest an easy extraction of starting or intermediate metal complexes caused by the fact that both monomer and products are good ligands for the metal complexes in this particular case.
新的
水溶性
配体1,3,5-三氮杂-7-磷杂金刚烷配合物的新的同核
镍(0)和
钯(0)配合物通过1H,13C和31P NMR光谱进行了制备和表征。这些配合物与已知的类似Ni(0)和Pd(0)配合物(三羟
甲基膦)一起,在无共溶剂或改性剂的
水相双层体系中发现可用作
丁二烯的寡聚或与
水的缩聚反应的催化剂。四羟
甲基膦镍(7)在首次
镍催化的
丁二烯水相双层体系寡聚反应中优先催化寡聚(线性和环状)。
钯配合物在定量产率下给出缩聚物或线性寡聚物。在三氮杂
磷金刚烷配合物(4)的情况下,观察到对
辛二烯醚的高选择性(87%)。在这些反应中,
金属溢出到产物相的高值表明由于在这种特殊情况下单体和产物均是
金属配合物的良好
配体,
金属配合物的起始或中间体易于提取。