Abstract
The cobalt-propargylation reaction proceeds under the influence of μ,ηhexacarbonyldicobalt complexes of acetylene alcohols of the propargyl structure in the presence of boron trifluoride diethyl etherate. The latter generates in situ a superstable carbenium cation Co2(CO)6(R)C≡CC(R2), where R are hydrogen atoms or different organic substituents. Such cations are sufficiently active electrophilic reagents [1–3]. It has been shown [2] that the μ,η-hexacarbonyldicobalt-2-propynol complex I reacts with ferrocene in the presence of BF3OEt2 to form the ferrocene derivative monosubstituted in the cyclopentadiene ring. With a four-fold excess of this complex the cobaltpropargylation occurs also in the second cyclopentadienyl ring to give the disubstituted product in a low yield.
Published Version
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