Palladium complexes of P,P and P,S type bidentate ligands: Implication in Suzuki–Miyaura cross-coupling reaction
作者:Kokil Saikia、Biswajit Deb、Bibek Jyoti Borah、Podma Pollov Sarmah、Dipak Kumar Dutta
DOI:10.1016/j.jorganchem.2011.10.001
日期:2012.1
New palladium complexes of the type [PdCl2(η2–P∩P)] (1a,1b) and [PdCl2(η2–P∩S)] (1c,1d) have been synthesised by the reaction of PdCl2 with P,P and P,S type bidentate ligands in 1:1 mol ratio, where, P∩P = 9,9–dimethyl-4,5-bis(diphenylphosphanyl) xanthene Xantphos}(a) or bis(2-diphenylphosphanylphenyl)etherDPEphos}(b); P∩S = 9,9-dimethyl-4,5-bis(diphenyl -phosphanyl) xanthenemonosulfide Xantphos(S)}(c)
类型[的PdCl的新钯络合物2(η 2 -(P∩P)]图1A,1B)和[的PdCl 2(η 2 - P∩S)](1C,1D)已经通过的PdCl反应合成2具有1:1摩尔比的P,P和P,S型双齿配体,其中P∩P= 9,9–二甲基-4,5-双(二苯基膦基)氧杂蒽Xantphos}(a)或bis(2-二苯基膦基苯基)醚DPEphos}(b); P∩S= 9,9-二甲基-4,5-双(二苯基-膦基)氧杂蒽硫醚Xantphos(S)} (c)或双(2-二苯基膦基苯基)醚单硫化物(DPEphos(S)}(d)。配合物的特征在于元素分析,质谱,1 H,13 C和31 P NMR光谱以及1a和1d的单晶X射线结构测定。所有配合物中的钯原子占据由P原子,P / S原子和两个Cl原子形成的略微扭曲的方形平面环境的中心。在室温下,Suzuki-Miyaura交叉偶联反应研究的1a - 1d的催化活性比PdCl