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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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低聚乙氧基醚链修饰的两亲性钯化合物及催化合成聚芴
DOI: 10.3724/SP.J.1105.2013.12386, PP. 1143-1150
Keywords: 两亲性,钯化合物,Suzuki缩聚,聚芴,数均分子量
Abstract:
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.
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