200878-19-9Relevant academic research and scientific papers
Synthesis and reactivity of [Pd2L2R2(μ-OH)2]-type complexes (L = PEt3 or PPh3; R = Me, PhCH2 or Ph). Crystal structure of [Pd2(PPh3)2Ph 2(μ-OH)(μ-NHC6H4OMe-p)]
Ruiz, Jose,Rodriguez, Venancio,Lopez, Gregorio,Chaloner, Penny A.,Hitchcock
, p. 4271 - 4276 (1997)
The metathesis of Cl- by OH- in [Pd2(PEt3)2R2(μ-Cl)2] gave the binuclear hydroxo complexes [Pd2(PEt3)2R2(μ-OH)2] (R = Me or PhCH2) which in CDCl3 solution exist as 1:1 mixtures of syn and anti isomers. They reacted with 3,5-dimethylpyrazole (Hdmpz) in 1:2 molar ratio to yield the corresponding azolate complexes anti-[Pd2(PEt3)2R2(μ-dmpz) 2] and with oxalic acid (H2ox), in 1:1 molar ratio, to afford the corresponding oxalate complexes anti-[Pd2(PEt3)2R2(μ-ox)]. The cleavage of the OH bridges of the di-μ-hydroxo complexes yields the mononuclear [Pd(PEt3)2R(OH)] which in solution are present as 1:1 mixtures of cis and trans isomers. Binuclear μ-hydroxo-μ-amido palladium complexes [Pd2L2R2(μ-OH)(ν-NHR″)2] (R = Me, L = PEt3; R = Ph, L = PPh3; R″ = Ph, C6H4Me-p, C6H4OMe-p, C6H4Cl-p or C6H4NO2-p) have been prepared by reaction of [Pd2L2R2(μ-OH)2] with the corresponding aromatic amine R″NH2. The NMR data indicate that the isolated complexes are the anti isomers. The crystal structure of complex [Pd2(PPh3)2Ph 2(μ-OH)(μ-NHC6H4OMe-p)] has been established; the Pd2ON ring is severely bent.
