Ein- bis dreikernige metall-π-derivate von hericen mit (Me3P)3Fe- und CpCo-fragmenten
作者:F.H. Köhler、A. Steck
DOI:10.1016/0022-328x(93)83070-c
日期:1993.2
The reaction of 2,3,5,6,7,8-hexamethylidenebicyclo[2.2.2]octane (hericene, 11), whose synthesis was optimized, with solvated FeCl2 and Na/Hg in the presence of PMe3 gave [(PMe3)3Fe](hericene) (12) and anti-[(PMe3)3Fe]2(hericene) (13). Both were characterized by H-1, C-13, and P-31 NMR spectroscopy including 2D-methods. In 13 one of the two Fe(PMe3)3 Moieties proved to be fluxional whereas 12 was rigid as seen by NMR spectroscopy. Cyclic voltammetry showed that 13 may be oxidized reversibly. 11 also reacted with cobaltocene and potassium to give [CpCo](hericene) (15), anti-[CPCo]2(hericene) (16), and all-trans-[CpCo]3(hericene) (17). The identity of 15-17 was proven by H-1 and C-13 NMR spectroscopy. Cyclic voltammetry showed 17 to undergo three successive oxidations to form the cations 17+, 17(2+), and 17(3+) which split off CpCo+ more easily than 2,3-dimethylbutadiene(cyclopentadienyl)cobalt. The splitting of the oxidation potential is an indication of the interaction between the CpCo moieties of 17.