Abstract
Abstract Cyclopentadienyl complexes with two or three SiMe3 substitutents have found widespread synthetic applications: π-complexes of the main group elements1 as well as of the f-group elements2 can be stabilized, hexane-soluble cationic complexes can be prepared3 and the stereochemical effects of these bulky substituents have been examined.4 A certainly interesting extension of this work to higher silylated complexes was, however, so far not feasible due to the lack of synthetic procedures for the preparation of these ligands.5 Only recently, we have shown that up to five SiMe2H substituents can be introduced into the cyclopentadienyl ligand of tricarbonyl(η5-cyclopentadienyl)manganese (“cymantrene”) starting from [C5Br5]Mn(CO)3 by a sequence of alternate bromine-lithium exchange reactions and electrophilic substitutions with SiMe2HCl.6
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