The synthesis and unique reactivity of a series of arylsulfonate-based nucleophile assisting leaving groups (NALG) containing oligomeric ether units (including crown ethers) attached to the arylsulfonyl ring in the ortho orientation are described. The reactions of a variety of these ethercontaining alkyl sulfonates with metal halides proceeded at substantially greater rates than electronically similar sulfonates. These ether-containing leaving groups also displayed marked selectivity for lithium halides relative to the corresponding sodium and potassium salts in nucleophilic displacement reactions.
The new bis(chalcogenopropargyl)ferrocene complexes [Fe(η5-C5H4EICH2C⋮CH)2] (EI =
Se, 1; EI = S, 2) have been prepared by treatment of the dilithiated [Fe(η5-C5H4Li)2] with Se
or S powder, followed by reaction with propargyl bromide. Reaction of 1 and 2 with [Fe2M(μ3-E)2(CO)9] (E = S, Se and M = Fe, Ru) forms new clusters which feature an unusual
five-membered FeEICHCCH2 ring with a π bond between the olefinic unit and the Fe atom,
and the Cp rings adopt an eclipsed arrangement. The structures of 1 and [Fe(η5-C5H4EICH2C⋮CH)(η5-C5H4{Fe2M(CO)8(μ-E)(μ3-E)(EICHCCH2)})] (M = Fe, E = Se, EI = Se, 3; M =
Fe, E = S, EI = Se, 4; M = Ru, E = S, EI = Se, 7) have been determined crystallographically.
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