Organozirconium and organohafnium chemistry

By the same token, Zr(II) is a particularly powerful reducing agent, forming robust dinitrogen complexes.

Being a larger atom, zirconium forms complexes with higher coordination numbers, e.g. polymeric [CpZrCl3]n vs monomeric CpTiCl3 (Cp = C5H5).

Zirconocene dibromide was prepared in 1953 by a reaction of the cyclopentadienyl magnesium bromide and zirconium(IV) chloride.

[5][6][7] The development of organozirconium reagents was recognized by a Nobel Prize in Chemistry to Ei-Ichi Negishi.

Zirconocene dichloride can be used to cyclise enynes and dienes to give cyclic or bicyclic aliphatic systems.

A zirconocene Ewen-style catalyst for producing syndiotactic polypropylene . [ 1 ]
The structure of Schwartz's reagent. [ 10 ]
Structure of tetrabenzylzirconium with H atoms omitted for clarity. [ 17 ]
Generic structure of a post-metallocene catalyst based on Dow's pyridyl-amido design.