SYNTHESIS OF PALLADIUM CYCLOPENTADIENYL COMPLEXES - DECAMETHYLPALLADOCENE DICATION [PD(ETA(5)-C(5)ME(5))](2+)

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)