Group 4 Metal Complexes of Boron Heterocycles

硼杂环第 4 族金属配合物

• 批准号: 9616889
• 负责人: Arthur Ashe
• 金额: $ 30万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-05-01 至 2001-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9616889&HistoricalAwards=false
• 关键词: Group; Metal; Complexes; Boron; Heterocycles

Dr. Arthur J. Ashe, III, Department of Chemistry, University of Michigan, is supported by the Inorganic, Bioinorganic, and Organometallic Program of the Chemistry Division for the study of heteroaromatic compounds involving group 13 and 15 elements and their transition metal complexes. Previous research has demonstrated that boratabenzene zirconium complexes can serve as homogeneous catalysts for the polymerization of olefins. Building on this result and by analogy to ansametallocenes that are known to be active catalysts, a series of metal complexes containing heteroaromatic ligands will be designed with the goal of obtaining highly active and stereospecific olefin polymerization catalysts. Specifically boratabenzene complexes which bear pendant substituents of varying electronic and steric demand and a series of bridged boratabenzene complexes will be prepared. These compounds will exploit variations in electron donating ability possible with the heteroaromatic ligands to fine tuning and develop more effective polymerization catalysts. Finally new boron containing heterocycles will be prepared in order to extend the range of heteroaromatic compounds available to be used as ligands. Transition metal complexes promote very selective catalytic and stoichiometric transformations of organic compounds. Much of the unique reactivity at the metal center is a reflection of the density of electrons surrounding the metal and this electron density can be controlled by adjusting the groups that are attached to the metal. A very common 'group' contains a ring of carbon-hydrogen units in what is called an 'aromatic' arrangement. In this project a series of metal complexes will be prepared in which an 'aromatic' group composed of carbon-hydrogen and boron species is attached to a metal. This will permit the electron density about the metal to be carefully adjusted in order to promote specific chemical and catalytic behavior and will set the ground work both to understand existing processes and to rationally design new ones.

密歇根大学化学系亚瑟J阿什博士，III， 由无机，生物无机和有机物计划支持 研究芳香杂环化合物的化学部 涉及第13和15族元素及其过渡金属络合物。 先前的研究表明，硼杂苯锆络合物 可用作烯烃聚合的均相催化剂。 基于这一结果，并通过类比已知的安萨金属茂， 作为活性催化剂，我们将设计一系列含杂环配体的金属配合物， 活性和立体定向的烯烃聚合催化剂。具体 带有不同侧基取代基的硼杂苯络合物， 电子和空间的需求和一系列的桥连硼杂苯配合物将被制备。这些化合物将利用 杂芳族配体可能的给电子能力， 微调和开发更有效的聚合催化剂。 最后 将制备新的含硼杂环以扩大可用作配体的杂芳族化合物的范围。 过渡金属络合物促进非常选择性的催化和 有机化合物的化学计量转化。在金属中心的许多独特的反应性反映了金属的密度。 电子围绕金属，并且该电子密度可以是 通过调节连接到金属上的基团来控制。一个非常 一个普通的“基团”包含一个碳氢单元环， 一种“芳香”排列。在这个项目中，一系列金属络合物将 其中由碳-氢组成的“芳族”基团和 硼物质附着在金属上。这将允许仔细调整金属周围的电子密度，以促进 具体的化学和催化行为，并将奠定基础工作 既要了解现有的流程，又要合理地设计新的流程。