Reactivity of [{M(C6F5)2(μ-OH)}2]2- (M = Pd or Pt) toward Aromatic Amines and Malononitrile
摘要:
Binuclear mu-hydroxo-mu-arylamido complexes [Pd-2(C6F5)(4)(mu-OH)(mu-NHR)](2-) (R = C6H5, C6H4-Cl-p, C6H4F-p) and di-mu-arylamido complexes [M-2(C6F5)(4)(mu-NHR)(2)](2-) (M = Pd, R = C6H5, C6H4Cl-p, C6H4F-p, C6H4NO2-p, C6F5; M == Pt, R = C6H4NO2-p, C6F5) have been prepared by reaction of [M-2(C6F5)(4)(mu-OH)(2)](2-) with the corresponding arylamine RNH2 in 1:1 or 1:2 molar ratio, respectively. The reaction of [Pd-2(C6F5)(4)(mu-NHPh)(2)](2-) with CS2 leads to the formation of the mononuclear dithiocarbamate complex [Pd(C6F5)(2)(S2CNHPh)](-). Malononitrile and methyl cyanoacetate react with [Pd-2(C6F5)(4)(mu-OH)(2)](2-) in methanol to give the binuclear complexes [Pd-2(C6F5)(4){mu-CH(CN)CN}(2)](2-) and [Pd-2(C6F5)(4){mu-CH(CO2Me)CN}(2)](2-). However the reaction of [Pd-2(C6F5)(4)(mu-OH)(2)](2-) with malononitrile in boiling methanol gives the mononuclear diiminato complex [Pd(C6F5)(2){NHC(OMe)CHC(OMe)NH}](-). In wet toluene [Pd-2-(C6F5)(4)(mu-OH)(2)](2-) produces the cyclotrimerization of malononitrile, giving 4,6-diamino-2-cyanomethyl-3,5-pyridinedicarbonitrile. The structures of [Pd-2(C6F5)(4)(mu-NHC6F5)(2)](2-) and [Pd-2(C6F5)(4){mu-CH(CN)CN}(2)](2-) have been determined by X-ray diffraction.