Perhalophenyl complexes of palladium(II) containing keto-stabilized phosphorus ylides of the type Ph2P(CH2)nPPh2CHC(O)R |
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| Institution: | 1. Synthetic Organic Chemistry Division, CSIR-North East Institute of Science and Technology, Jorhat 785006, Assam, India;2. Chemical Engineering Division, CSIR-North East Institute of Science and Technology, Jorhat 785006, Assam, India |
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| Abstract: | From suitable perhalophenyl derivatives of palladium(II), viz.: Pd(C6F5)2-(SC4H8)2, Pd(μ-X′) (C6X5)2]2(NBu4)2, Pd(μ-Cl)(C6X5)(SC4H8)]2 (X = F, Cl, X′ = Cl, Br), new complexes of various types have been prepared, viz.: trans-Pd(C6F5)2(Y)2, Pd(C6X5)2(Y), PdCl(C6X5)(Y) (X = F, Cl). The neutral ligand Y is a keto-stabilized phosphorus ylide of the type Ph2P(CH2)nPPh2CHC(O)R (n = 1, R = CH3, C6H5; n = 2, R = C6H5) acting in a terminal monodentate P-donor or a bidentate chelate P,C-donor mode. The reaction of PdCl(C6F5)(Y) complexes with HCl leads to the corresponding PdCl2(C6F5)(YH) complexes in which the phosphonium cation YH]+ behaves as monodentate P-donor at its phosphinic end.IR and 31P NMR spectroscopy were used to decide the coordination mode of the ligands and, in some cases, to reveal the presence of two isomers. |
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