Synergic Monodeprotonation of Bis(benzene)chromium by Using Mixed Alkali Metal-Magnesium Amide Bases and Structural Characterization of the Heterotrimetallic Products

摘要

Developed by Elschenbroich in the late 1960s,the reaction of bis(benzene)chromium with TMEDA-activated nBuLi still represents today the standard method for metalating the sandwich complex (TMEDA is N,N,N',N''-tetramethylethyle-nediamine).Metalation plays a pivotal part in the development of bis(benzene)chromium chemistry,which celebrates its 50th anniversary in 2005,as in transforming the parent neutral compound to a more reactive carbanionic form,it opens up a gateway to a plethora of selectively functionalized derivatives.