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

The complex Fc(CHCH)₂C⋮C-TMS (Fc = ferrocenyl) was obtained from Wittig olefination of FcCH₂PPh₃Br with TMS-C⋮CCHCHCHO in THF. The conjugated monometallic diene can be desilylated to give Fc(CHCH)₂C⋮CH, which reacted with RuHCl(CO)(PPh₃)₃ to produce Fc(CHCH)₃RuCl(CO)(PPh₃)₂. Treatment of the latter complex with PMe₃, 4-phenylpyridine (PhPy), 2,6-(Ph₂PCH₂)₂C₅H₃N (PMP), and KTp (Tp = hydridotris(pyrazolyl)borate) gave Fc(CHCH)₃RuCl(CO)(PMe₃)₃, Fc(CHCH)₃RuCl(CO)(PhPy)(PPh₃)₂, Fc(CHCH)₃RuCl(CO)(PMP), and Fc(CHCH)₃RuTp(CO)(PPh₃), respectively. The structures of Fc(CHCH)₂C⋮CH and Fc(CHCH)₃RuCl(CO)(PMe₃)₃ have been confirmed by X-ray diffraction.