Blann Kevin, Bollmann Annette, Brown Gavin M, Dixon John T, Elsegood Mark R J, Raw Christopher R, Smith Martin B, Tenza Kenny, Willemse J Alexander, Zweni Pumza
R & D Division, Sasol Technology (Pty) Ltd., 1 Klasie Havenga Road, Sasolburg, South Africa.
Department of Chemistry, Loughborough University, Loughborough, Leics LE11 3TU, UK.
Dalton Trans. 2021 Mar 28;50(12):4345-4354. doi: 10.1039/d1dt00287b. Epub 2021 Mar 10.
Chromium(iii) complexes of chelating diphosphines, with PNP or PCNCP backbones, are excellent catalysts for ethylene tetra- and/or trimerisations. A missing link within this ligand series are unsymmetric chelating diphosphines based on a PCNP scaffold. New bidentate PCNP ligands of the type PhPCHN(R)PPh (R = 1-naphthyl or 5-quinoline groups, 2a-d) have been synthesised and shown to be extremely effective ligands for ethylene tri-/tetramerisations. Three representative tetracarbonyl Cr complexes bearing a single PN(R)P (5), PCN(R)P (6), or PCN(R)CP (7) diphosphine (R = 1-naphthyl) have been prepared from Cr(CO)(η-nbd) (nbd = norbornadiene). Furthermore we report a single crystal X-ray diffraction study of these compounds and discuss their structural parameters.
具有PNP或PCNCP主链的螯合二膦的铬（III）配合物是乙烯四聚和/或三聚反应的优良催化剂。基于PCNP支架的不对称螯合二膦是该配体系列中的一个缺失环节。已合成了新型双齿PCNP配体PhPCHN（R）PPh（R = 1-萘基或5-喹啉基，2a-d），并证明它们是乙烯三聚/四聚反应的极其有效的配体。由Cr（CO）（η-降冰片二烯）（nbd = 降冰片二烯）制备了三种带有单个PN（R）P（5）、PCN（R）P（6）或PCN（R）CP（7）二膦（R = 1-萘基）的代表性四羰基铬配合物。此外，我们报道了这些化合物的单晶X射线衍射研究，并讨论了它们的结构参数。
