Reversible C−C Coupling in a Uranium Biheterocyclic Complex
摘要:
The C-C coupling of two molecules of 1-methylbenzimidazole was effected by a neutral uranium dibenzyl complex supported by a ferrocene 1,1'-diamide ligand. The transformation involves the C-H activation of two heterocycles and the coupling of one eta(2)-N,C-imidazolyl fragment with a coordinated 1-methylbenzimidazole ligand. The solid-state structure of this product was studied by both single-crystal and powder X-ray diffraction methods and confirms the formation of the biheterocyclic moiety. In solution, the C-C coupling event was found to be reversible, as assessed by variable-temperature H-1 and H-2 NMR spectroscopy as well as DFT calculations and reactivity studies.
Ring opening of aromatic heterocycles by uranium complexes
作者:Selma Duhović、Marisa J. Monreal、Paula L. Diaconescu
DOI:10.1016/j.jorganchem.2010.08.003
日期:2010.12
reactivity of a uranium dibenzyl complex supported by a ferrocene-diamide ligand toward aromatic N-heterocycles was investigated. Although ringopening occurred, a complicated behavior was observed with 1-methylbenzimidazole and benzoxazole. On the other hand, when a uranium benzyl η2-N,C-benzimidazole complex reacted with quinoline, alkyl transfer to the pyridine ring was observed.