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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Cyclopropenylidene carbene ligands in palladium catalysed coupling reactions: Carbene ligand rotation and application to the Stille reaction
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Cyclopropenylidene carbene ligands in palladium catalysed coupling reactions: Carbene ligand rotation and application to the Stille reaction

机译:钯催化的偶联反应中的环丙烯亚基卡宾配体:碳烯配体的旋转及其在斯蒂勒反应中的应用

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摘要

Reaction of [Pd(PPh_3)_4] with 1,1-dichloro-2,3- diarylcyclopropenes gives complexes of the type cis-[PdCl_2(PPh _3)(C_3(Ar)_2)] (Ar = Ph 5, Mes 6). Reaction of [Pd(dba)_2] with 1,1-dichloro-2,3-diarylcyclopropenes in benzene gave the corresponding binuclear palladium complexes trans-[PdCl_2(C _3(Ar)_2)]_2 (Ar = Ph 7, p-(OMe)C _6H_48, p-(F)C_6H_49). Alternatively, when the reactions were performed in acetonitrile, the complexes trans-[PdCl_2(NCMe)(C_3(Ar)_2)] (Ar = Ph 10, p-(OMe)C_6H_411 and p-(F)C_6H_4) 12) were isolated. Addition of phosphine ligands to the binuclear palladium complex 7 or acetonitrile adducts 11 and 12 gave complexes of the type cis-[PdCl _2(PR_3)(C_3(Ar)_2)] (Ar = Ph, R = Cy 13, Ar = p-(OMe)C_6H_4, R = Ph 14, Ar = p-(F)C _6H_4, R = Ph 15). Crystal structures of complexes 6·3.25CHCl_3, 10, 11·H_2O and 12-15 are reported. DFT calculations of complexes 10-12 indicate the barrier to rotation about the carbene-palladium bond is very low, suggesting limited double bond character in these species. Complexes 5-9 were tested for catalytic activity in C-C coupling (Mizoroki-Heck, Suzuki-Miyaura and, for the first time, Stille reactions) and C-N coupling (Buchwald-Hartwig amination) showing excellent conversion with moderate to high selectivity.
机译:[Pd(PPh_3)_4]与1,1-二氯-2,3-二芳基环丙烯的反应生成顺式[[PdCl_2(PPh _3)(C_3(Ar)_2)]类型的配合物(Ar = Ph 5,Mes 6 )。 [Pd(dba)_2]与1,1-二氯-2,3-二芳基环丙烯在苯中的反应得到相应的双核钯配合物反式-[PdCl_2(C _3(Ar)_2)] _ 2(Ar = Ph 7,p -(OMe)C _6H_48,p-(F)C_6H_49)。或者,当反应在乙腈中进行时,复合物反式-[PdCl_2(NCMe)(C_3(Ar)_2)](Ar = Ph 10,p-(OMe)C_6H_411和p-(F)C_6H_4)12)孤立。将膦配体添加到双核钯配合物7或乙腈加合物11和12中得到顺式[PdCl _2(PR_3)(C_3(Ar)_2)]类型的配合物(Ar = Ph,R = Cy 13,Ar = p -(OMe)C_6H_4,R = Ph 14,Ar = p-(F)C _6H_4,R = Ph 15)。报道了配合物6·3.25CHCl_3、10、11·H_2O和12-15的晶体结构。配合物10-12的DFT计算表明,绕卡宾-钯键旋转的障碍非常低,表明这些物种中双键的特性有限。测试了复合物5-9在C-C偶联(Mizoroki-Heck,Suzuki-Miyaura和首次进行Stille反应)和C-N偶联(Buchwald-Hartwig胺化)中的催化活性,显示出优异的转化率,具有中等至高选择性。

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