Reductive elimination of halogens assisted by phosphine ligands in Fe(CO)4X2 (X=I,Br) complexes
作者:Gianfranco Bellachioma、Giuseppe Cardaci、Alceo Macchioni、Chiara Venturi、Cristiano Zuccaccia
DOI:10.1016/j.jorganchem.2006.05.041
日期:2006.9
Fe(CO)4X2 complexes [X = I (1), Br(1′)] react with phosphine ligands L (L = PMe3, PEt3, PMe2Ph, PMePh2, PPh3) via a two-step mechanism: in the first step fac-Fe(CO)3LX2 complexes are formed; in the second step two parallel pathways, a and b, are observed; in pathway a, reductive elimination with formation of equimolar amounts of Fe(CO)3L2 (5) and phosphonium salts [LX]+X− is observed; in pathway b
的Fe(CO)4 X 2配合物[X = I(1),溴(1 ')]与膦反应配位体L(L = PME 3,PET 3,PME 2 PH,PMePh 2,PPH 3)经由双步骤机理:在第一步中,形成fac -Fe(CO)3 LX 2络合物。在第二步中,观察到两个平行的路径a和b;在途径a中,通过消除等摩尔量的Fe(CO)3 L 2(5)和phospho盐[LX]来进行还原消除+ X -中观察到; 在途径b中,形成二取代的二卤化物络合物顺式,反式,顺式-Fe(CO)2 L 2 X 2。途径a和b的相对重量取决于配体L的碱性,位阻和浓度,卤素的性质和温度。提出了一种占大多数实验结果的根本机理。