Cobalt‐Catalyzed Selective Oxidation of the Tritertiary Phosphane Triphos with Molecular Oxygen
作者:Katja Heinze、Gottfried Huttner、Laszlo Zsolnai
DOI:10.1002/cber.19971301007
日期:1997.10
The reactivity of complexes of triphos [CH3C(CH2PPh2)3] and CoCl2 towards dioxygen has been investigated. Reaction of the pseudo-tetrahedral complex (η2-triphos)CoCl2 (1) with dioxygen yields after work-up the mixed phosphane/phosphaneoxide ligands triphosO and triphosO2. The novel ligand triphosO2 can be obtained in quantitative yield using catalytic amounts of 1. In order to gain some insight into
electrophiles such as CH3I, C2H5I and C6H5CH2Cl to give Rh(III) complexes of the types [Rh(CO)(COR)ClXL] R = –CH3 (2a–2c), –C2H5 (3a–3c); X = I and R = –CH2C6H5 (4a–4c); X = Cl}. Kinetic data for the reaction of a–c with CH3I indicate a first-order reaction. The catalytic activity of 1a–1c for the carbonylation of methanol to acetic acid and its ester is evaluated and a higher turn over number (TON = 1564–1723)
二聚铑前体[Rh(CO)2 Cl] 2与两个摩尔当量的1,1,1-三(二苯基膦甲基)乙烷三卤化配体[CH 3 C(CH 2 P(X)Ph 2)3 ]的反应(L),其中X = O(a),S(b)和Se(c)提供[Rh(CO)2 Cl(L)](1a-1c)类型的络合物。配合物1a–1c的特征在于元素分析,质谱,IR和NMR(1 H,31 P和13 C)光谱以及配体a–c通过单晶X射线衍射确定结构。1a-1c与不同的亲电试剂(例如CH 3 I,C 2 H 5 I和C 6 H 5 CH 2 Cl )进行氧化加成(OA)反应,得到[Rh(CO)(COR)类型的Rh(III)络合物ClXL] R = –CH 3(2a–2c),–C 2 H 5(3a–3c); X = I,R = –CH 2 C 6 H 5(4a–4c);X = Cl}。a–c与CH 3反应的动力学数据我表示一阶反应。评估了1a–1c
Preparation and structures of polymeric lanthanide nitrate complexes of CH3C[CH2P(O)Ph2]3
作者:Anthony M.J. Lees、Andrew W.G. Platt
DOI:10.1016/j.poly.2004.12.003
日期:2005.2
The synthesis of complexes between lanthanide nitrates and MeC(CH2P(O)Ph-2)(3) (=L) in ethanol or methanol leads to the formation of polymeric complexes Ln(NO3)(3)L as alcohol solvates. The ligand adopts a chelating-bridging mode. The structures of the complexes La(NO3)(3)L . EtOH and Pr(NO3)(3)L . MeOH are reported and the coordination of L is discussed in terms of that of the related free ligand EtC(CH2P(O)Ph-2)(3). Infrared spectroscopy implies structural differences between the early and later lanthanide complexes. (C) 2004 Elsevier Ltd. All rights reserved.