Synthesis and Characterization of (CHCH)<sub>3</sub>-Bridged Heterobimetallic Ferrocene−Ruthenium Complexes

The complex Fc(CHCH)<sub>2</sub>C⋮C-TMS (Fc = ferrocenyl) was obtained from Wittig olefination of FcCH<sub>2</sub>PPh<sub>3</sub>Br with TMS-C⋮CCHCHCHO in THF. The conjugated monometallic diene can be desilylated to give Fc(CHCH)<sub>2</sub>C⋮CH, which reacted with RuHCl(CO)(PPh<sub>3</sub>)<sub>3</sub> to produce Fc(CHCH)<sub>3</sub>RuCl(CO)(PPh<sub>3</sub>)<sub>2</sub>. Treatment of the latter complex with PMe<sub>3</sub>, 4-phenylpyridine (PhPy), 2,6-(Ph<sub>2</sub>PCH<sub>2</sub>)<sub>2</sub>C<sub>5</sub>H<sub>3</sub>N (PMP), and KTp (Tp = hydridotris(pyrazolyl)borate) gave Fc(CHCH)<sub>3</sub>RuCl(CO)(PMe<sub>3</sub>)<sub>3</sub>, Fc(CHCH)<sub>3</sub>RuCl(CO)(PhPy)(PPh<sub>3</sub>)<sub>2</sub>, Fc(CHCH)<sub>3</sub>RuCl(CO)(PMP), and Fc(CHCH)<sub>3</sub>RuTp(CO)(PPh<sub>3</sub>), respectively. The structures of Fc(CHCH)<sub>2</sub>C⋮CH and Fc(CHCH)<sub>3</sub>RuCl(CO)(PMe<sub>3</sub>)<sub>3</sub> have been confirmed by X-ray diffraction.