Heterocycles as ligands. X. 2,2',5,5'-Tetra-tert-butyl-1,1'-diazaferrocene. Stabilization of the diheterometallocene structure by steric shielding.
Stable title compd. I was prepd. in 56% yield by the reaction of the corresponding lithiopyrrole with FeCl2. The x-ray anal. of I reveals a distorted sandwich structure influenced by repulsive interactions presumably both between the N atoms and the bulky Me3C substituents.
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