摘要:
Treatment of Cp* RuL2Cl (Cp* = C5Me5; L = PPh3, PMe3) with Me3SiC=C:H in the presence of NH4[PF6] in CH2Cl2 yielded the expected vinylidene compounds [Cp *RuL2=C=CH2][PF6] with L = PPh3 (1) and PMe3 (1a), which were deprotonated by KOBut in THF to give the corresponding ethynyl complexes Cp*Ru(PPh3)(2)C=CH (2) and Cp*Ru(PMe3)(2)C=CH (2a). Metalation of 2 using n-BuLi or t-BuLi in THF-hexane, followed by reaction of the lithio intermediate Cp*Ru(PPh3)(2)C=CLi with CIER3 (E = Si, Ge, Sn) or ClPR2, resulted in the formation of substituted derivatives, Cp*Ru(PPh3)(2)C=CER3 [ER3 = SiMe3 (3), GeMe3 (4), SnBu3n (5)] and Cp*Ru(PPh3)(2)C=CPR2 [PR2 = PPh2 (6), PBu2t (7)] respectively. Quaternization of 6 and 7 by alkyl iodides in toluene smoothly produced phosphonioethynyl complexes, [Cp*Ru(PPh3)(2)C=CPR2R']I [PR2R' = PPh2Me (8), (PBu2Me)-Me-t (9), PPh2Prn (10), (PBu2Prn)-Pr-t(11)], the cations of which may be regarded as donor/acceptor-stabilized derivatives of dicarbon, C-2.