Reactions of η~5-cycIopentadienylruthenium(II) complexes with γ-hydroxyacetylenes

摘要

The complexes [CpRuL_2Cl] (L = PPh_3, AsPh_3, SbPh_3) react with the phenylacetylene, γ-hydroxyacetylenes HC ≡ CCR_1 R_2OH (R_1 = R_2 = H, Me, and R_1 = Me, R_2 = Et; CR_1R_2OH = 1-hydroxycyclohexanol) and NaBF_4 in methanol, to yield complexes of the type η~1-vinylidenes [CpL_2Ru~+(=C=CHR)], η~1- al-lenylidene [CpL_2Ru~+(=C=C=CR_1R_2)], and dimeric allenylidene-vinyl and vi-nylidene-alkylidene complexes. These η~1-vinylidene and η~1-allenylidene complexes are reversibly deprotonated by sodium borohydride in methanol to yield the corresponding η~1-alkynyl complexes [CpL_2Ru(C ≡ CR)].