Arylation of phosphoryl-stabilized carbanions with metal π-complexes of aryl chlorides and fluorides
作者:Galina A Artamkina、Petr K Sazonov、Irina P Beletskaya
DOI:10.1016/s0040-4039(01)00717-1
日期:2001.6
The nucleophilic aromatic substitution of halogen in metal arene π-complexes η6-(ArF)Cr(CO)3 and [η6-(ArHal)FeCp]+[PF6]− (Hal=F,Cl) with phosphoryl-stabilized carbanions ZCH2P(O)(OEt)2 (Z=COOEt, CN) allows the synthesis of metal π-complexes of α-EWG-substituted arylmethylphosphonates in high yields.
Nucleophilic aromatic substitution of halogen in neutral and cationic pi-complexes of haloarenes eta(6)-(ArF)Cr(CO)3 and [eta(6)-(ArHlg)FeCp](+)[PF6](-) (Hlg = F, Cl) by carbanions derived from alpha-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 [eta(6)-ArCHZP(O)(OEt)(2)}FeCp](+) [PF6](-) with 1,10-phenanthroline in acetonitrile on exposure to daylight yields 32-44% of the free diethyl arylmethylphosphonates.