Dinuclear Palladium(II) and -(III) Compounds with O,O-Chelating Ligands. Room-Temperature Direct 2-Phenylation of 1-Methylindole
作者:Susana Ibáñez、Francisco Estevan、Pipsa Hirva、Mercedes Sanaú、M Angeles Úbeda
DOI:10.1021/om300400k
日期:2012.12.10
New dinuclearpalladium(III) compounds of general formula Pd2[(C6H4)PPh2]2[O–O]2Cl2, O–O being chelating phenolates C6H4OC(O)R (R = CH3, 3a; R = C2H5, 3b; R = OPh, 3c) or acetylacetonates RC(O)CHC(O)R (R = CH3, 4a; R = CF3, 4b; R = C(CH3)3, 4c), have been obtained by oxidation with PhICl2 of the corresponding palladium(II) compounds. The stability of the new compounds has been studied by 31P NMR spectroscopy
通式为Pd 2 [(C 6 H 4)PPh 2 ] 2 [O-O] 2 Cl 2的新型双核钯(III)化合物,O-O为螯合酚盐C 6 H 4 OC(O)R(R = CH 3,图3a ; R = C 2 H ^ 5,图3b ; R = OPH,图3c)或乙酰丙酮化物RC(O)CHC(O)R(R = CH 3,图4a ; R = CF 3,图4b ; R = C( CH 3)3,图4c)是通过用PhICl 2氧化相应的钯(II)化合物而获得的。通过31 P NMR光谱在200至298 K范围内研究了新化合物的稳定性。还对配合物的稳定性进行了DFT计算。在这些计算中的协议,仅化合物PD 2 [(C 6 H ^ 4)PPH 2 ] 2 [(CF 3 C(O)CHC(O)CF 3 ] 2氯2,6b中,显示出最高的热稳定性。图6b用X射线衍射法表征了Pd-Pd的最长距离,即2,6403(6)Å,在已描述的离散Pd