Potential Group IV olefin polymerization catalysts that contain a diamido ligand substituted with hexaisopropylterphenyl groups

摘要

The diamine rac-H-2[HIPTN2] (HIPTN2 = (N-hexa-iso-propyl-3,5-terphenyl)diaminobinaphthalene) has been prepared through palladium-catalyzed N-aryl coupling of diaminobinaphthalene and 3,5-bis(2,4,6-triisopropylphenyl)bromobenzene. The reaction between H-2[HIPTN2] and M(NMe2)(4) (M = Ti, Zr, and Ho yields [HIPTN2] M(NMe2)(2) complexes. Other complexes of [HIPTN2](2-) that have been prepared include [HIPTN2]ZrCl2, [HIPTN2]ZrMe2, [HIPTN2]Zr(CH2CMe3)(2), [HIPTN2]HfCl2, [HIPTN2]HfMe2, and [HIPTN2]Hf(CH2CHMe2)(2). Activation of [HIPTN2]ZrMe2 with a variety of Lewis acids gives rise to different species depending on the nature of the activator employed. For example, [HIPTN2]ZrMC2 reacts with [Ph3C][B(C6F5)(4)] to give a cationic complex that is active toward oligomerization of 1-hexene, while activation with B(C6F5)(3) leads to formation of [HIPTN2]Zr(C6F5)(2). No polymerization of 1-hexene by activated complexes was observed. (c) 2005 Elsevier Ltd. All rights reserved.