Abstract
Nucleophilic aromatic substitution of halogen in neutral and cationic π-complexes of haloarenes η6-(ArF)Cr(CO)3 and [η6-(ArHlg)FeCp]+[PF6]- (Hlg = F, Cl) by carbanions derived from α-substituted diethyl methylphosphonates [CHZP(O)(OEt)2]- (Z = CN, COOEt), generated in situ by the action of Cs2CO3, leads to formation of the corresponding arylmethylphosphonate complexes in 78-88% yield. The reaction of the complexes [η6-{ArCHZP(O)(OEt)2}FeCp]+ [PF6]- with 1,10-phenanthroline in acetonitrile on exposure to daylight yields 32-44% of the free diethyl arylmethylphosphonates.
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