Abstract
There is an exceptional degree of steric hindrance to attack on the zirconium atom in (1,1′ferrocenediyl)bis(tert-butylcyclopentadienyl)zirconium, as shown by studies of the reactivity of the complex towards protic reagents. Some dissymmetrically disubstituted metallocenes, ( tBuC 5H 4) 2Zr(X)-(C 5H 5)Fe(C 5H 5) with X OH, OAr′, OR, OCOPh have been synthesized. Some of them were used to make symmetrically disubstituted metallocenes ( tBuC 5H 4) 2ZrX 2, X OAr′, OR, OCOPh. By using radical species the chalcogenated complexes ( tBuC 5H 4) 2Zr(EPh)(C 5H 4FeC 5H 4EPh), E S, Se, have been prepared.
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