Zirconium complexes reduction chemistry

Treatment of zirconocene dichloride, 50, with 2 equiv. of an appropriate alkyllithium or Grignard reagent generates transient zirconocene olefin complexes that upon loss of alkene provide access to zirconocene, 109, and the powerful reduction chemistry of divalent zirconium.48 Owing to the utility of this reagent in organic synthesis and organometallic reactions, the low-temperature alkylation of zirconocene dichloride, 50, with BunLi has been... 

Reduction of Cp2ZrCl2 with 1.5equiv. of sodium amalgam affords the fulvalene complex CpZr(/r-Cl) 2(/r-C5H4-C5H4) 28.35 COMC(1995) summarized a number of phosphido, sulfide, imido, and alkyl complexes derived from 28. Cuenca and co-workers have since reported further investigations into the chemistry of 28, leading to new zirconium(iv) /(-imido. //-(r/2.r/2-N.N-hydrazido), and //-(r/ -C r/2-C,N-isocyanido) dinuclear fulvalene derivatives.36... 

---