ortho-Effect of Hexacarbonyldicobaltacetylene Substituent: of Propargyl Type in Aromatic Systems

摘要

In this work we analyzed the features of cobalt-propargylation of some aromatic systems (ferrocene, five-membered nitrogen-containing heterocycles, thiophenes) with μ,η~2-hexa-carbonyldicobalt complexes of acetylenic alcohols of the propargyl type. The cobalt-propargylation reaction proceeds under the influence of μ,η~2- hexacarbonyldicobalt 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].