Zirconium complexes with silylamido ligands

An improved salt metathesis route has been developed for the high-yield synthesis of -Cp-silylamido zirconium dimethyl complexes in a one-pot fashion.336 Thus, treatment of the neutral amidosilyl-functionalized tetramethyl-Cp ligand with 4 equiv. of MeLi in diethyl ether, followed by addition of ZrCl4 in pentane, gives the desired zirconium dimethyl complex 477 in 89% yield (Scheme 107). The analogous reaction with the amidosilyl-functionalized Ind ligand affords the corresponding zirconium dimethyl complex 478 in 90% yield. 

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