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合成了一系列不同链长的双低聚乙氧基醚链修饰的三苯基膦,并以此为配体制备了相应的二价钯化合物.此类化合物在空气中具有良好稳定性,易溶于常用的有机溶剂.作为单组份催化剂,在无相转移试剂及无需补加膦配体条件下,能够有效催化Suzuki缩聚反应.在甲苯/水聚合体系中,可得到数均分子量(Mn)为7×104左右的聚芴.随着乙氧基醚链单元数的增加,Mn提高至近1×105.GPC谱图分析证实,亲水基团的引入使钯化合物具有了明显的两亲性,进而促进了金属转移步骤,使得聚合物分子量得以提高.
A series of bis-oligo-polyethoxy ether chain modified triphenylphosphine were synthesized and used as ligands to prepare the corresponding divalent palladium compounds. These compounds have good stability in the air, easy Soluble in common organic solvents. As a one-component catalyst, without phase transfer reagents and without additional phosphine ligand conditions, can effectively catalyze the Suzuki polycondensation reaction in the toluene / water polymerization system, the number average molecular weight (Mn ) Of about 7 × 104 polyfluorene.With the increase in the number of ethoxy ether chain units, Mn increased to nearly 1 × 105. GPC spectral analysis confirmed that the introduction of hydrophilic groups so that the palladium compound has a significant amphiphilic This, in turn, facilitates the metal transfer step so that the molecular weight of the polymer is increased.