Intermediate Oxidation States and pi-Donor Ligands as a Means to High Reactivity in the Early Transition Metals

在这个无机化学、生物无机化学和有机金属化学项目中，亚利桑那大学的David E.Wigley将研究最近发现的一种芳烃Ta络合物以及过渡金属处于中间氧化态的其他相关Ta和W络合物的化学。这些化合物可能在发展碳氢活化化学以及在有机化学，特别是芳烃化学中产生新的合成方法方面有价值。中间氧化态ı的组合，通常是钽(III)或钨(IV)！和硬的pi给体配体ı，典型的是烷氧基！可以预期赋予这些络合物很高的反应性。对这些芳烃过渡金属醇盐化合物的一般合成路线进行了研究，探讨了分子内C-H金属化的机理，并对芳烃部分的其他反应进行了综述。

In this project within the Inorganic, Bioinorganic and Organo- metallic Chemistry Program, David E. Wigley of the University of Arizona will investigate the chemistry of a recently discovered arene tantalum complex and other related complexes of tantalum and tungsten in which the transition metals are in intermediate oxidation states. These compounds may be of value in developing carbon-hydrogen activation chemistry as well as leading to new synthetic methodologies in organic chemistry and in arene chemistry in particular. The combination of intermediate oxidation states ıtypically tantalum(III) or tungsten(IV)! and hard pi-donor ligands ıtypically alkoxides! can be expected to impart high reactivity to these complexes. General synthetic routes to these arene transition metal alkoxide compounds will be investigated, the mechanism of intramolecular C-H metallation examined, and other reactions of the arene moieties surveyed.