Synthesis and reactivity of new mixed dicyclopentadienyl Group 4 metal complexes with the doubly bridged bis(dimethylsilanediyl)-cyclopentadiene-(η5-cyclopentadienyl) ligand

Abstract

The monocyclopentadienyl titanium complex [Ti{(C 5 H 4 )(SiMe 2 ) 2 (h The catalytic activity of compounds 3 -5 for ethylene polymerization has been studied using MAO as cocatalyst.

Synthesis and structures of binuclear half-sandwich cobalt (III) ortho-carboranedithiolato complexes with silyl-bridged bis(cyclopentadienyl) ligands

“…IR (film): m(methyl) 1252 cm À1 . The 1 H NMR spectrum was in good agreement with the reported literature [10].…”

“…Synthesis of the (g 5 -C 5 H 3 ) 2 (Si 2 Me 2 ) 2 complexes For comparison with the mono-bridged binuclear cobalt complexes, we have also investigated both the synthesis and structures of the cobalt analogues derived from the dibridged cyclopentadienyl ligand (C 5 H 4 ) 2 (Si 2 Me 2 ) 2 (6), as depicted in Scheme 2. The ligand 6 can be easily prepared in 75% yield by the reaction of the Me 2 SiCl 2 with the sodium salt of 1, following a slightly modified literature method [10].…”

Reactions of Doubly Bridged Biscyclopentadienes with Molybdenum (Tungsten) Carbonyl

“…Compared to their nonbridged and single-bridged analogues, these complexes exhibit unique characteristics in both their structures and reactivity. Reactions of doubly bridged biscyclopentadiene (C 5 H 4 ) 2 (SiMe 2 ) 2 with metal carbonyl compounds have been extensively studied in the past decade. , We have recently investigated the reaction of a certain type of doubly bridged biscyclopentadiene ligands with Fe(CO) 5 and obtained a series of diiron complexes with superlong Fe−Fe bond distances and novel complexes with Fe−Si or Fe−Ge bonds . This paper will further report the reaction of the doubly bridged biscyclopentadiene ligands with molybdenum and tungsten carbonyl.…”