在改进的方法中,合成了复合物{2,6-双[(二苯基膦基)甲基]苯}氯钯(II)(1)作为其THF加合物,并通过X射线晶体学确定了结构。在Stille反应中研究了{2,6-双[(二苯基膦基)甲基]苯}(三氟乙酰基)钯(II)(2)的催化性能。事实证明,络合物2是极低的催化剂负载量(0.1-0.0001%),是三甲基苯基锡烷与芳基溴化物之间CC交联的极佳催化剂,可提供高达6.9 x 10(5)的高周转率(TONs)。催化反应的动力学研究表明,由PCP Pd(II)预催化剂形成的多相胶体钯催化剂。
在改进的方法中,合成了复合物{2,6-双[(二苯基膦基)甲基]苯}氯钯(II)(1)作为其THF加合物,并通过X射线晶体学确定了结构。在Stille反应中研究了{2,6-双[(二苯基膦基)甲基]苯}(三氟乙酰基)钯(II)(2)的催化性能。事实证明,络合物2是极低的催化剂负载量(0.1-0.0001%),是三甲基苯基锡烷与芳基溴化物之间CC交联的极佳催化剂,可提供高达6.9 x 10(5)的高周转率(TONs)。催化反应的动力学研究表明,由PCP Pd(II)预催化剂形成的多相胶体钯催化剂。
Insertion of Carbon Dioxide into (PCP)Pd<sup>II</sup>−Me Bonds
作者:Roger Johansson、Martin Jarenmark、Ola F. Wendt
DOI:10.1021/om0505561
日期:2005.9.1
A (PCP)PdMe complex has been synthesized and structurally characterized, displaying a very long Pd-Me bond. It is reactive toward CO2 insertion, giving the corresponding acetate in quantitative yield. The methyl complex can be regenerated using ZnMe2, and catalytic carboxylation is possible in benzene.
The first synthesis of stable palladium(II) PCP-type catalysts supported on silica—application to the Heck reaction
作者:Ratana Chanthateyanonth、Howard Alper
DOI:10.1016/s1381-1169(03)00158-4
日期:2003.7
An efficient method for the formation of a silica-immobilized tridentate diphosphinoaryl ligand (PCP-type) palladium(II) complex (11) is described and successfully used as a catalyst for the Heck reaction. Commercially available 5-amino-isophthalic acid dimethyl ester was converted to N-acetyl-3,5-bis(chloromethyl)aniline (4) in three steps, by reduction, acetylation, and chlorination (Scheme 1). Arbuzov reaction of 4 led to the diphosphine oxide (5). Deprotection and functional group manipulations allowed the transformation of 5 into N-[3,5-bis-(diphenyl-phosphinoylmethyl)-phenyl]-succinamic acid (7). Subsequent reduction of 7 with HSiCl3 afforded the diphosphine (8) attached to silica by transforming compound 8 to N-3,5-bis[(diphenyl-phosphanyl)methyl]-phenyl}-succinamic acid 2,5-dioxo-pyrrolidin-1-yl ester (9). Palladium(II) trifluoroacetate was used to form the PCP-type palladium(II) complex. This complex shows high catalytic activity in the Heck reaction for aryl iodides, and it is also active with aryl bromides. The catalyst is thermally stable and it is also stable towards oxygen and moisture. In addition, it can be recycled by simple filtration in air and reused with moderate loss of activity. (C) 2003 Elsevier Science B.V. All rights reserved.