New bis(fluoro-ponytailed) bipyridine ligands for Pd-catalyzed Heck reactions under fluorous biphasic catalysis condition
作者:Norman Lu、Yan-Chou Lin、Jeng-Yung Chen、Chi-Wen Fan、Ling-Kang Liu
DOI:10.1016/j.tet.2006.12.053
日期:2007.2
the Pd complex 2c dissolves only in fluorinated solvents, for instance FC77, which is mainly n-C8F18. The novel Pd complex 2c has been tested as a catalyst in Heck reactionsunder a fluorousbiphasiccatalysis condition. It was found that the Pd complex 2c, after an easy separation, keeps its catalytic activity (>90% yield), even after seven runs. The TGA studies indicate that the Pd complexes 2a–c are
三种高度氟化的联吡啶衍生物(4,4'-bis(R f CH 2 OCH 2)-2,2'-bpy)R f = HCF 2(CF 2)7(1a),n -C 8 F 17(在图1b)中,已经使用4,4'-双(BrCH 2)-2,2'-bpy和相应的氟化醇盐合成了n -C 10 F 21(1c)} 。配体1a – c的氟含量分别为58.3%,59.8和62.3%。尽管氟含量很高,但配体具有-CF 2 H极性末端基团的1a更溶于有机溶剂。配体1b是白色固体,并且仍然适度溶于CH 2 Cl 2中。配体1c具有高的亲氟性,对于n -C 8 F 18 / CH 2 Cl 2系统,分配比为42:1 。配体1a – c与[PdCl 2(CH 3 CN)2 ]的反应产生了新型Pd络合物[PdCl 2(4,4'-bis-(R f CH 2 OCH2)-2,2'-bpy)],其中R f分别为HCF 2(CF 2)7(2a),n
Synthesis, structure and reactivity of novel palladiumdichloride-2,2′-bipyridine with 4,4′-bis(fluorous-ponytail)
作者:Norman Lu、Yan-Chou Lin、Jeng-Yung Chen、Tsung-Chi Chen、Shih-Chieh Chen、Yuh-Sheng Wen、Ling-Kang Liu
DOI:10.1016/j.poly.2007.02.009
日期:2007.8
showed an almost quantitative conversion and could be reused for eight runs with Heck reactions, in that the products and unspent reactants were directly removed by distillation. With the highest fluorinecontent in the series, Pd complex 2e was successfully applied in the Heck reaction using the fluorousbiphasiccatalysis strategy.