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Formation of C–C Bonds in Diiron Complexes by Addition of Carbanions to Alkynyl(methoxy)carbene Ligands by Luigi Busetto; Fabio Marchetti; Stefano Zacchini; Valerio Zanotti is a Chemistry article available to read on EtoBox.

What is Formation of C–C Bonds in Diiron Complexes by Addition of Carbanions to Alkynyl(methoxy)carbene Ligands about?

## Abstract Addition of cyanide ions to the alkynyl(methoxy)carbene complexes [Fe~2~{μ‐CN(Me)(R)}(μ‐CO)(CO){C~α~(OMe)C~β~≡C~γ~R'}(Cp)~2~]^+^ (R = Xyl, R' = Tol, 1a; R = Xyl, R' = Ph, 1b; R = Xyl, R' = Me~3~Si, 1c; R = Me, R' = Tol, 1d; R = Me, R' = Ph, 1e) occurs selectively at C~α~ to afford the 1,1‐disubstituted σ‐propargyl complexes [Fe~2~{μ‐CN(Me)(R)}(μ‐CO)(CO){C(OMe)(CN)(C≡CR')}(Cp)~2~] (R = Xyl, R' = Tol, 2a; R = Xyl, R' = Ph, 2b; R = Xyl, R' = Me~3~Si, 2c; R = Me, R' = Tol, 2d; R = Me,R' = Ph, 2e). Conversely, the stabilised carbanaions[CH(R)~2~]^–^ (R = CN, CO~2~Me) add at the C~γ~ position with subsequent hydrogen migration to C~β~ to give the 1‐σ‐buta‐1,3‐dienyl complexes [Fe~2~{μ‐CN(Me)(Xyl)}(μ‐CO)(CO){C~α~(OMe)=C~β~HC~γ~(Tol)=C~δ~(R)~2~}(Cp)~2~] (R = CN, 3a; CO~2~Me, 3b). No migration is possible in the absence of hydrogen atoms at C~δ~, therefore addition of [C(Me)(CO~2~Me)~2~]^–^ to 1a results in the formation of the σ‐allenyl complex [Fe~2~{μ‐CN(Me)(Xyl)}(μ‐CO)(CO){C~α~(OMe)=C~β~=C~γ~(Tol)C~δ~(Me)(CO~2~Me)~2~}(Cp)~2~] (4). Protonation of the neutral complexes 3b and 4affords the vinyl(methoxy)carbene complexes [Fe~2~{μ‐CN(Me)(Xyl)}(μ‐CO)(CO){C~α~(OMe)C~β~H=C~γ~(Tol)C

Who reads Formation of C–C Bonds in Diiron Complexes by Addition of Carbanions to Alkynyl(methoxy)carbene Ligands?

Author

Luigi Busetto; Fabio Marchetti; Stefano Zacchini; Valerio Zanotti

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Ltd.; Wiley (ISSN 1434-1948)

Published

2005

Language

EN

Field

Chemistry (Physical Sciences)