ETA(2)-(N,C)-Pyridine Micrometers-ETA(2)(1,2):ETA(2)(4,5)-Benzene Complexes of (Silox)3Ta (Silox = t-Bu3SiO-)

摘要

The unusual capability of transition metals to coordinate to pi-systems of organic molecules is recognized as playing a historic and important role in the growth of organometallic chemistry. This development is manifested in the widespread usage of aromatic hydrocarbons, such as cyclopentadienyl anion and arenes, as ancillary ligands bound with maximum hapticity to various metals. Less common, but inherently interesting, are modes of binding which disturb the aromaticity of the fragment, yet fall short of utilizing the hydrocarbon's full complement of pi-electrons. Presented herein are pyridine (eta 2)7 and benzene mu (eta 2) (1,2)(eta 2(4,5) adducts of (silox)3Ta (1,silox = T-Bu3SiO-)8 which exhibit intriguing coordination geometries. Reprints. (AW)