The palladium pentamethycyclopentadiene complex [Pd(eta(4)-C(5)Me(5)H)
Cl-2] (1) reacted with AgBF4, in the presence of 1,5-cyclooctadiene or
pentamethylcyclopentadiene, to give the cationic compounds [Pd(eta(4)
-diene)(C(5)Me(5))](BF4-)-B-+ (diene = C8H12 (2) or C(5)Me(5)H(3)). Th
e cyclopentadienyl complex [Pd(eta(4)-C(5)Me(5)H)(eta(5)-C5H5)](BF4-)-
B-+ (4) was prepared by the action of a mixture of CpTl and TlBF4 on 1
in acetone solution. Cyclic voltammetry showed that all three complex
es 2-4 can be oxidized and reduced. The oxidation of 3 with (NH4)(2)[C
e(NO3)(6)] leads to the first pallodocene; the decamethylpalladocene d
ication [Pd(eta(5)-C(5)Me(5))(2)](2+) (BF4-)(2) (5)