Nonsymmetric Palladium Complexes of Partly Fluorinated Bisphosphine Ligands: Efficient Catalysts for Flexible Propene/CO Copolymer Materials of Ultrahigh Molecular Weight
作者:Uwe W. Meier、Frank Hollmann、Ulf Thewalt、Martti Klinga、Markku Leskelä、Bernhard Rieger
DOI:10.1021/om0302138
日期:2003.9.1
osphino}propane ligands 1b−f [aryl: b = 3,5-bis(trifluoromethyl)phenyl, c = 3,5-dimethylphenyl, d = 3,5-difluorophenyl, e = 2-(trifluoromethyl)phenyl, f = 2,4,6-trifluorophenyl] and their corresponding neutral dichloro palladium(II) 2b−f, diiodo palladium(II) 3d,e, and dicationic diacetonitrile palladium(II) ditetrafluoroborate complexes 4b−f were synthesized. The symmetric ligand 1,3-bisbis[3,5
五个新的非对称1-二苯基膦基-3- 双[芳基]膦基}丙烷配体1b - f [芳基: b = 3,5-双(三氟甲基)苯基,c = 3,5-二甲基苯基,d = 3,5-二氟苯基,e = 2-(三氟甲基)苯基,f = 2,4,6-三氟苯基]及其相应的中性二氯钯(II)2b - f,二碘钯(II)3d,e和二乙二腈钯(II)合成了二四氟硼酸盐络合物4b - f。对称配体1,3-双双[双[3,5-双(三氟甲基)苯基]膦基}丙烷(制备1a)和相关的钯(II)配合物2a和4a用于比较。通过X射线结构分析以二氯(2a - c,f)和二碘(3d,e)化合物的形式确定了新配体的固态结构。在丙烯/ CO共聚实验中测试了对称催化剂(4a)和非对称催化剂(4b - f)的性能。观察到这些配体的主要空间效应与催化剂活性以及所得聚酮材料的分子量之间存在明显的相关性。非对称结构图4b,轴承CF 3个基团以两种芳基单元上的一个磷侧的3