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Lithiation of the diamine CH 2 (CH 2 NHSiMePh 2 ) 2  using n-butyl lithium and subsequent reaction with zirconium tetrachloride yielded the bis(chelate)-amidozirconium complex [Zr{CH 2 (CH 2 NSiMePh 2 ) 2 } 2 ]- The spirocyclic molecule has a distorted tetrahedral coordination at the zirconium centre with overall C 2  symmetry broken only by the relative orientation of four phenyl rings. The bulky diphenylmethylsilyl substituents at the amido-N functions as well as the ligand backbone sterically protect the metal centre and render it inert towards conproportionation with zirconium chloride.

Bis[1,3-bis(diphenylmethylsilylamido)propane]zirconium: A Spirocyclic Complex Containing a Sterically Demanding Chelating Amido Ligand