Early Transition Metal Complexes with Polydentate Polyanionic Ligands as Olefin Polymerization Catalysts

该项目由无机，生物无机和有机化学计划支持，将支持过渡研究的继续 金属聚合催化剂由J. Boncella教授 佛罗里达大学。 过渡金属配合物的研究 多配位基、多阴离子配体将与以下物质一起进行 目标：1）继续开发烯烃复分解催化剂 聚合和解聚的机制，重点是 最近开发的钨基催化剂， N，N '-双（三甲基甲硅烷基）-邻苯二酰胺，2）用这种钨观察到的C-H键活化反应的可能应用 化合物，3）开发将进行复分解反应的催化剂 聚合和齐格勒-纳塔型聚合在同一金属 中心，以及4）合成一类新的聚阴离子配体 在吡咯烷配体上，包括一些携带比 连接原子。 这类新的配体有望导致 高氧化态前过渡金属络合物的合成 协调数异常低，这可能增强了 反应性 过渡金属催化剂的性能在很大程度上取决于 根据连接到所述聚合物上的基团（配体）的类型和数量， 活性金属中心 该项目涉及的综合和研究 几种新的催化剂。 本研究的目标包括：（1） 开发新型的聚合催化剂， 并且允许单体的聚合， 由于催化剂的不稳定性而不能聚合，2）开发双功能 可用于共缩聚两种单体的催化剂， 不同的聚合机制。

This project supported by the Inorganic, Bioinorganic, and Organometallic Chemistry Program will support the continuation of studies of transition metal polymerization catalysts by Professor J. Boncella of the University of Florida. Studies of transition metal complexes of polydentate, polyanionic ligands will be undertaken with the following objectives: 1) continued development of catalysts for olefin metathesis polymerization and depolymerization with emphasis on the mechanism of action of a recently developed tungsten-based catalyst of N,N'-bis(trimethylsilyl)-o-phenylenediamide, 2) possible applications for C-H bond activation reactions that are observed with this tungsten compound, 3) development of catalysts that will perform both metathesis polymerization and Zeigler-Natta type polymerizations at the same metal center, and 4) the synthesis of a new class of polyanionic ligands based upon the pyrrolide ligand, including some that carry more charge than ligating atoms. This new class of ligands is expected to lead to the synthesis of high oxidation state early transition metal complexes that have unusually low coordination numbers and which may have enhanced reactivity. The properties of transition metal catalysts are critically dependent upon the type and number of groups (ligands) that are attached to the active metal center. This project involves the synthesis and study of several new catalysts. Among objectives of this research are 1) the development of new types of polymerization catalysts that are thermally robust and allow for the polymerization of monomers that cannot currently be polymerized because of catalyst instability, and 2) the development of dual function catalysts that can be used to co-polymerize two monomers that undergo polymerization by different mechanisms.