Synthesis, Characterization, and Reaction Studies of Metal-Pentadienyl Compounds

无机，生物无机和有机金属化学专业的这个项目是在过渡金属有机金属化学领域。该项目的重点是有机分子戊二烯与所谓的过渡金属（如钛、钒和铬）结合的化合物。这类化合物与广泛用作工业催化剂的环戊二烯化合物相似，用环戊二烯取代环戊二烯，热稳定性和化学反应性得到了显著提高。该化合物的潜在应用包括金属薄膜的沉积和聚合反应的催化。继锆化合物的制备之后，将尝试为锰和第二和第三行过渡金属制备新的开放式金属茂物，即双（环戊二烯基）金属化合物，因为目前还没有已知的双（环戊二烯基）化合物。新化合物的结构将被确定，它们的反应化学将被探索。探讨了高取代的戊二烯基配体的应用，特别是具有硅基和硅氧基取代基的配体。将制备含有“开放富烯”配体的双金属化合物，以便通过连接的五二烯配体探索金属-金属间的通信。探讨了戊二烯基偶联反应的潜在应用，包括硝基、异硝基、炔、亚胺和酰基等试剂。后一种反应预计会涉及有用的成环反应，在某些情况下会产生双环有机分子。

This project in the Inorganic, Bioinorganic and Organometallic Chemistry Program is in the area of transition metal organometallic chemistry. The focus of the project is compounds in which the organic molecule pentadiene is coupled with the so-called transition metals, such as titanium, vanadium and chromium. Such compounds are similar to the the compounds of cyclopentadiene which are used extensively as industrial catalysts, and the substitution of pentadiene for cyclopentadiene brings about substantial enhancements of thermal stability and chemical reactivity. Potential applications of the pentadienyl compounds include the deposition of metal films and the catalysis of polymerization reactions. The preparation of new open metallocenes, i.e., bis(pentadienyl)metal compounds, will be attempted for manganese and for second and third row transition metals, following up on the preparation of such a compound of zirconium, for which no bis(cyclopentadienyl) compound is known. The structures of the new compounds will be determined, and their reaction chemistry will be explored. The utilization of highly-substituted pentadienyl ligands will be explored, especially ligands with silyl and siloxy substituents. Bimetallic compounds containing "open fulvalene" ligands will be prepared so that metal-metal communciation via the linked pentadienyl ligands may be explored. Potential applications of pentadienyl coupling reactions will be explored, involving such reagents as nitriles, isonitriles, alkynes, imines, and acyl groups. Some of the latter reactions are expected to involve useful ring-forming reactions, leading in some cases to bicyclic organic molecules.