Bridged bi-aromatic ligands, catalysts, processes for polymerizing and polymers therefrom
申请人:Symyx Technologies, Inc.
公开号:US20040014950A1
公开(公告)日:2004-01-22
New ligands and compositions with bridged bis-aromatic ligands are disclosed that catalyze the polymerization of monomers into polymers. These catalysts with metal centers have high performance characteristics, including higher comonomer incorporation into ethylene/olefin copolymers, where such olefins are for example, 1-octene, propylene or styrene. The catalysts also polymerize propylene into isotactic polypropylene.
Strongly binding, rapidly complexing, ion selective spherands
作者:Donald J. Cram、Ira B. Dicker
DOI:10.1039/c39820001219
日期:——
Cyclicureaunits bound to anisyl or methylene units have been incorporated into 20-membered ring hosts whose complexation of alkali metal and ammonium ions show high binding free energies, high extraction rates, and high ion selectivities.