单晶X射线衍射揭示了这些双钍配合物中芳烃都采用μ-η6,η6-的配位模式(图2下),其中配位的芳环中的碳–碳键键长明显长于中性的芳环。特别地,在T h 2 -naph中,非配位的芳环上的碳–碳键键长呈现单双键交替的现象,表明非配位芳环出现了去芳构化,这可能是T h 2 -naph稳定性较低的原因。单晶结构数据...
A new catalytic procedure of ortho-olefination of benzoates and benzaldehydes has been developed. Ester and carboxaldehyde units were revealed to be effective chelating groups in focusing the activation of aryl C-H bonds ortho to the directing moieties under the Rh-catalyzed oxidative conditions. The...