Formation of anionic palladium(0) complexes ligated by the trifluoroacetate ion and their reactivity in oxidative addition
作者:Christian Amatore、Anny Jutand、Frédéric Lemaıˆtre、Jean Luc Ricard、Sebastian Kozuch、Sason Shaik
DOI:10.1016/j.jorganchem.2004.05.012
日期:2004.11
intramolecular reducing agents and are oxidized to triarylphosphine oxides. The generated Pd0 complexes are anionic species ligated by the trifluoroacetate anion: Pd0(PAr3)n(OCOCF3)− (n = 2 or 3). Pd0(PAr3)2(OCOCF3)− is the reactive species involved in the oxidative addition to PhI. This leads to trans-PhPd(OCOCF3)(PPh3)2, involved in equilibrium with the cationic complex trans-[PhPd(PPh3)2(DMF)]+, instead
如先前针对Pd(OAc)2所建立的那样,Pd 0络合物是由Pd(OCOCF 3)2和n当量原位形成的。三芳基膦(4-ZC 6 H 4)3 P(Z = CF 3,F,Cl,H,CH 3;n = 3)。膦是分子内还原剂,并被氧化成三芳基膦氧化物。生成的Pd 0络合物是由三氟乙酸根阴离子连接的阴离子物质:Pd 0(PAr 3)n(OCOCF 3)-(n = 2或3)。Pd 0(PAr 3)2(OCOCF 3)-是与PhI氧化加成反应的反应性物质。这导致反式-PhPd(OCOCF 3)(PPh 3)2参与与阳离子络合物反式-[PhPd(PPh 3)2(DMF)] +的平衡,而不是预期的反式-PhPdI(PPh 3)2复杂的。由前体Pd(OAc)2传递的乙酸根离子或三氟乙酸根离子连接的阴离子Pd 0络合物的存在或Pd(OCOCF 3)2,以及它们在氧化添加物中的比较反应性与理论DFT计算是一致的。