404892-91-7Relevant academic research and scientific papers
HALF-METALLOCENE COMPOUNDS AND CATALYST COMPOSITIONS
-
Page/Page column 64, (2012/08/08)
The present invention provides polymerization catalyst compositions employing half-metallocene compounds with a heteroatom-containing ligand bound to the transition metal. Methods for making these hybrid metallocene compounds and for using such compounds in catalyst compositions for the polymerization of olefins also are provided.
Monocyclopentadienyltitanium aryloxide complexes: Preparation, characterization, and application in cyclization reactions
Sturla, Shana J.,Buchwald, Stephen L.
, p. 739 - 748 (2008/10/08)
A variety of monocyclopentadienyltitanium aryloxide complexes were prepared, characterized by X-ray crystallography, and used to catalyze or mediate cyclization reactions. Structural characterization allowed for the comparison of steric parameters of various 2,6-disubstituted aryloxide ligands. Transformations of dienes and enynes - including the catalysis of a 1,6-diene cycloisomerization and the intramolecular Pauson - Khand reaction - were investigated. A titanium metallacycle was prepared from a sterically hindered enyne containing a trisubstituted olefin. The Pauson - Khand reaction of trimethylsilyl-substituted enynes was promoted to generate α-silylcyclopentenones.
