Well-defined redox-active polymers and block copolymers prepared by living ring-opening metathesis polymerization
作者:D. Albagli、G. Bazan、M. S. Wrighton、R. R. Schrock
DOI:10.1021/ja00037a017
日期:1992.5
ferrocene (2) or phenothiazine (3), were prepared and polymerized by 1a or 1b to give living block copolymers containing the ring-opened norborene derivatives. The living polymer was cleaved from the metal in a Wittig-like reaction with pivaldehyde, trimethylsilylbenzaldehyde, or octamethylferrocenecarboxaldehyde. Polydispersities for the longer block copolymers containing up to approximately}90 monomer units
Mo(CH-t-Bu)(NAr)(Ot-Bu)sub 2} (1a) in Thf/0.1 M [n-Busub 4}N]AsFsub 6} 在电位高达1.0 V 并在 Pt 电极上在 -2.16 V vs SCE 处发生可逆的一个电子还原。可以通过用乙烯基二茂铁处理1a来合成含有二茂铁基亚甲基配体(1b)的类似引发剂。含有二茂铁 (2) 或吩噻嗪 (3) 的降冰片烯的氧化还原活性衍生物通过 1a 或 1b 制备和聚合,得到含有开环降冰片烯衍生物的活性嵌段共聚物。在与新戊醛、三甲基甲硅烷基苯甲醛或八甲基二茂铁甲醛的类维蒂希反应中,活性聚合物从金属上裂解下来。通过 GPC,发现含有多达 大约}90 个单体单元的较长嵌段共聚物的多分散性低至 1.05。在一种情况下,由含二茂铁单体制成的均聚物的多分散性通过 FD 质谱测定为 1.06。DSC 研究表明,均聚物和嵌段共聚物的微相研究表明氧