Synthesis and properties of crown ether-modified phosphines and their use as ligands in transition metal catalysts
作者:Tamon Okano、Masahiro Iwahara、Hisatoshi Konishi、Jitsuo Kiji
DOI:10.1016/0022-328x(88)80123-2
日期:1988.5
palladium and rhodium catalysis. The catalytic activities correlated well with the extractabilities of the phosphine ligands. The compound [RhCl(cod)]2, combined with IIIc and IIId, shows high activities toward catalytic hydrogenation of potassium and caesium cinnamates, respectively. Replacement of allyl bromide with powdered sodium or potassium iodide in benzene to give allyl iodide are catalyzed by
一系列冠醚改性的三芳基膦,1,2-二苯基膦基-2,3,5,6,8,9-六氢-1,4,7,10-苯并四氧杂环丁环素(IIIa)及其更高的同系物(III)(据报道,常见的命名法是3 n-二苯基膦基苯并[3 n-冠-n ]醚(n = 4、5、6和7)。评估了提取碱金属苦味酸盐的热力学参数。膦III(n = 5和6)与na +和K +形成1:1化学计量的冠状配合物。观察到的可萃取性与腔尺寸选择性的概念非常吻合。热力学参数Δ ħ °和Ť Δ小号dgC时萃取络合的°分别为-63至-58 kJ / mol和-41至-35 kJ / mol,因此ΔG °由焓项控制。这些膦作为均相钯和铑催化的辅助配体应用于液相-液相或液相-固相反应。催化活性与膦配体的可萃取性密切相关。化合物[RhCl(cod)] 2与IIIc和IIId结合,分别对肉桂酸钾和肉桂酸铯的催化加氢表现出高活性。烯丙基溴与粉状碘化钠或碘化钾的