Methods for the preparation of fluorenyl-type ligand structures and substituted fluorenyl groups which may be employed in metallocene-type olefin polymerization catalysts. There is provided a 2,2′-dihalogen-diphenylmethylene having a methylene bridge connecting a pair of phenyl groups. Each phenyl group has a halogen on a proximal carbon atom relative to the methylene bridge. The halogenated diphenylmethylene is reacted with a coupling agent comprising a Group 2 or 12 transition metal in the presence of a nickel or palladium-based catalyst to remove the halogen atoms from the phenyl groups and couple the phenyl groups at the proximal carbon atoms to produce a fluorene ligand structure. The coupling agent may be zinc, cadmium or magnesium and the catalyst may be a monophosphene nickel complex. The halogenated diphenylmethylene may be an unsubstituted ligand structure or a monosubstituted or disubstituted ligand structure. The halogenated diphenylmethylene may be monosubstituted with a tertiary butyl group or may be a dialkyl diphenylmethylene having alkyl substituents at the directly distal positions of the phenyl groups relative to the methylene bridge.
制备荧烯型
配体结构和取代荧烯基团的方法,可用于
金属茂嗪型烯烃聚合催化剂。提供了一种2,2'-二卤代二苯
甲烷,其具有连接一对苯基的亚甲基桥。每个苯基在相对于亚甲基桥的近端碳原子上具有卤素。在
镍或
钯基催化剂的存在下,将卤代二苯
甲烷与包含第2或12族过渡
金属的偶合剂反应,以去除苯基上的卤素,并在近端碳原子上耦合苯基,从而产生荧烯
配体结构。偶合剂可以是
锌、
镉或
镁,催化剂可以是单膦基
镍配合物。卤代二苯
甲烷可以是未取代的
配体结构,也可以是单取代或双取代的
配体结构。卤代二苯
甲烷可以是单取代的叔丁基基团,也可以是具有烷基取代基的二烷基二苯
甲烷,在苯基相对于亚甲基桥的直接远端位置上具有取代基。