A highly enantioselective asymmetric Darzens reaction catalysed by proline based efficient organocatalysts for the synthesis of di- and tri-substituted epoxides
A new class of easily available and readily tunable proline based chiral organocatalysts was found to efficiently catalyse an unprecedented highly enantioselective asymmetric Darzens reaction of α-chloro ketones and substituted α-chloro ketones with various aldehydes, which directly produces optically active di- and tri-substituted chiral epoxides with higher product yields (up to 97 %) and excellent
Oxidation of Alkynes by the HOF·CH<sub>3</sub>CN Complex
作者:Sharon Dayan、Iris Ben-David、Shlomo Rozen
DOI:10.1021/jo001101i
日期:2000.12.1
MOLAR RATIO MODIFICATIONS TO LARGER POLYOLEFIN CATALYSTS
申请人:BASF Corporation
公开号:EP2242776A1
公开(公告)日:2010-10-27
[EN] MOLAR RATIO MODIFICATIONS TO LARGER POLYOLEFIN CATALYSTS<br/>[FR] MODIFICATIONS DE RAPPORT MOLAIRE APPORTÉES À DES CATALYSEURS DE POLYOLÉFINES DE PLUS GRANDE TAILLE
申请人:BASF CATALYSTS LLC
公开号:WO2009088596A1
公开(公告)日:2009-07-16
Disclosed are catalyst systems and methods of making the catalyst systems/supports for the polymerization of an olefin containing a solid titanium catalyst component having a substantially spherical shape and containing an internal electron donor, a support made by contacting substantially equal molar amounts of a magnesium compound and an epoxy compound in the presence of an aprotic solvent and subsequent treatment with a halogenating agent to provide a magnesium based catalyst support. The catalyst system can further contain an organoaluminum compound and an organosilicon compound. Also disclosed are methods of polymerizing or copolymerizing an alpha-olefin. The methods involve contacting an olefin with a catalyst system containing the solid titanium catalyst component.