Biphenol-based ligands for Cu-catalyzed asymmetric conjugate addition
摘要:
The synthesis and characterization of seven new phosphoramidite ligands are described, as well as their use in copper-catalyzed 1,4-addition of diethylzine to a wide range of substrates. Enantioselectivities of up to >99.5% are obtained. (C) 2004 Elsevier Ltd. All rights reserved.
Oxide‐Bridged Heterobimetallic Aluminum/Zirconium Catalysts for Ethylene Polymerization
作者:Cédric Boulho、Harmen S. Zijlstra、Sjoerd Harder
DOI:10.1002/ejic.201500123
日期:2015.4
and the NMR spectra of the aluminum complex (DIPH)AlMe and the bimetallic Al/Zr species reveal in both cases dimeric complexes. The crystal structure of [Cp*Zr-2(Me)OAl(DIPH)](2) shows a planar Al2O2 core and a terminal Cp*Zr-2(Me)O group. Ethylenepolymerization in toluene was studied for the bimetallic complex with a variety of scavengers. Under comparable polymerization conditions, the methylalumoxane-activated
The synthesis and characterization of seven new phosphoramidite ligands are described, as well as their use in copper-catalyzed 1,4-addition of diethylzine to a wide range of substrates. Enantioselectivities of up to >99.5% are obtained. (C) 2004 Elsevier Ltd. All rights reserved.
Biphenol-Based Phosphoramidite Ligands for the Enantioselective Copper-Catalyzed Conjugate Addition of Diethylzinc
作者:Alexandre Alexakis、Damien Polet、Stéphane Rosset、Sébastien March
DOI:10.1021/jo049359m
日期:2004.8.1
Phosphoramidite ligands, based on ortho-substituted biphenols and a chiral amine, induce high enantioselectivities (ee's up to 99%) in the copper-catalyzed conjugateaddition of dialkylzinc reagents to a variety of Michael acceptors. Particularly, the best reported ee's were obtained for acyclic nitroolefins.