Zirconium nitrogen-donors

Aluminum alkoxides form few well-behaved adducts with nitrogen bases. However, species of the type [Al2(OR)6(en)] (en = ethylenediamine) have been isolated.230 The parent alcohol itself can in some cases act as the donor group. Hence, the isopropoxide of zirconium can be readily recrystallized from isopropyl alcohol as the adduct Zr(OPri)4 PriOH. 

The cyclic jt ligand derived from tropine in which an aUyl group is completed with nitrogen as a two-electron donor atom leads to the synthesis of bis tropidinyl zirconium dichloride... 

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