Investigation of catalyst-transfer condensation polymerization for the synthesis of <i>n</i>
-type π-conjugated polymer, poly(2-dioxaalkylpyridine-3,6-diyl)
作者:Yutaka Nanashima、Rena Shibata、Ryo Miyakoshi、Akihiro Yokoyama、Tsutomu Yokozawa
DOI:10.1002/pola.26152
日期:2012.9.1
Kumada‐Tamao coupling polymerization of 6‐bromo‐3‐chloromagnesio‐2‐(3‐(2‐methoxyethoxy)propyl)pyridine 1 with a Ni catalyst and Suzuki‐Miyaura coupling polymerization of boronic ester monomer 2, which has the same substituted pyridine structure, with tBu3PPd(o‐tolyl)Br were investigated for the synthesis of a well‐defined n‐type π‐conjugated polymer. We first carried out a model reaction of 2,5‐dibromopyridine
带有Ni催化剂的6-溴-3-氯代镁2-2-(3-(2-甲氧基乙氧基)丙基)吡啶1的Kumada-Tamao偶联聚合和具有相同取代吡啶的硼酸酯单体2的Suzuki-Miyaura偶联聚合研究了具有t Bu 3 PPd(o- tolyl )Br的结构,用于合成定义明确的n型π共轭聚合物。我们首先在Ni(dppp)Cl 2存在下进行了2,5-二溴吡啶与0.5当量的苯基氯化镁的模型反应然后观察到2,5-二苯基吡啶的排他性形成,表明通过Ni(0)催化剂在吡啶环上的分子内转移发生了连续的偶联反应。然后,我们检查了1的Kumada-Tamao聚合反应,发现它均匀进行以提供可溶的,区域规则的头对尾聚(吡啶-2,5-二基),聚(3-(2-(2-(2-(甲氧基乙氧基) )丙基)吡啶)(PMEPPy)。然而,使用几种Ni和Pd催化剂获得的聚合物的分子量分布非常宽,基质辅助激光解吸电离飞行时间质谱表明该聚合物具有Br