[1]Borahafnocenophanes: Synthesis, Structure and Catalytic Activity

Abstract

5 , 15] were synthesised in high yields by a convenient two-step, one-pot synthesis, and their constitution in solution elucidated from multinuclear NMR spectroscopic data. Suitable single crystals of complexes 13 and 15 were subjected to X-ray diffraction studies, thus providing the first structural

Alternative synthesis and crystal structure of a [2]boraferrocenophane

“…These compounds have attracted considerable interest [10,11], since corresponding [1]borazirconocenophanes constitute active catalysts for the polymerization of olefins [1][2][3][4][5]12] and the highly strained [1]boraferrocenophanes proved their propensity to undergo ring-opening polymerization yielding poly(ferrocenyl)boranes [8,9,13]. Two different routes have been applied to the synthesis of these complexes.…”

“…[1]Borametallocenophanes comprising a three coordinate bridging boron centre have been reported for a variety of transition metals from group 4 [1][2][3][4][5], 5 [6], 6 [7] and 8 [8,9]. These compounds have attracted considerable interest [10,11], since corresponding [1]borazirconocenophanes constitute active catalysts for the polymerization of olefins [1][2][3][4][5]12] and the highly strained [1]boraferrocenophanes proved their propensity to undergo ring-opening polymerization yielding poly(ferrocenyl)boranes [8,9,13].…”

Theoretical studies on the role of bridging group of CGC type ligands for the Ziegler–Natta catalysis

“…Since Kaminsky and co-workers [1,2] discovered metallocenes bridging with Si atom between ligands as cyclopentadienyl (Cp) for the catalysis of polymerization in 1980, ansa-metallocenes of the early transition metals have attracted attention for homogeneous catalysis. Recently, the reactivity and the structures of ansa-metallocenes with several bridging atoms or groups were studied experimentally [3][4][5][6][7][8][9][10][11][12][13][14]. In our previous paper [15], the structures and the energies of the initial reaction of ethylene polymerization for the Ziegler-Natta catalysis with eight bridging groups of Cp ligands were studied by an ab initio MO and a density functional method.…”

The Role of Bridging Group of Cyclopentadienyl Ligands for the Ziegler–Natta Catalysis: Theoretical Study

“…They proposed (4,4 0 ,5,5 0 -tetramethyl)bis(fluorenylidene)(1,2-ethylidene) zirconium dichloride as the most active metallocene complex there. The reactivity and structures for metallocene bridging with boron atoms were also studied by some groups [6][7][8][9][10][11][12].…”