Synthetic, Structural, and Mechanistic Studies of Organo- metallic Compounds Derived from Three-Membered Organic Rings

在无机，生物无机， 和器官计划，罗素P休斯博士的 达特茅斯学院化学系将继续 碳-碳断裂和形成的研究 过渡金属促进的键。 三个项目将是 追求：乙烯基环丙烯重排中的开环; η-3-环丙烯基络合物的表征，包括 它们的CO取代反应和转动势垒; 空间不稳定的配体的裂解。 后一种反应不是通过简单的金属插入进行的 进入碳碳键。 为了研究 在开环反应过程中发生的反应 选择性同位素标记的配体 将准备好前体。 一种1，2，3-三叔丁基环戊二烯并 已经制备了二烯基配体;优点将是 与化合物相关的初始应变， 新化合物。 %%% 通过对碳-碳键机理的详细研究， 过渡金属的制造和破坏，Russell P. Hughes博士 达特茅斯学院的研究人员希望能增进了解 这对石油催化剂很重要 行业 这些结果可能与以下方面特别相关： 碳环化合物的形成和控制。

With the support of this award in the Inorganic, Bioinorganic, and Organometallic Program, Dr. Russell P. Hughes of the Chemistry Department, Dartmouth College, would continue investigations on the cleavage and formation of carbon-carbon bonds promoted by transition metals. Three projects would be pursued: ring-opening in vinylcyclopropene rearrangements; characterization of eta-3-cyclopropenyl complexes, including their CO substitution reactions and rotation barriers; and bond cleavage of sterically destabilized cyclopentadienyl ligands. The latter reactions do not proceed by simple metal insertion into the carbon-carbon bond. In order to study the skeletal rearrangments that occur during the ring opening reactions of the cyclopentadienyl ligands, selectively isotopically labelled precursors will be prepared. A 1,2,3,-tri-t-butylcyclopenta- dienyl ligand has been prepared; advantage will be made of the incipient strain associated with the compound in order to make novel compounds. %%% By investigating in detail the mechanism of carbon-carbon bond making and breaking by transition metals, Dr. Russell P. Hughes of Dartmouth College hopes to achieve increased understanding of this reaction which is important to the petroleum catalyst industry. The results could be particularly relevant to the formation and control of carbon ring compounds.