Chromium imine and amine complexes as homogeneous catalysts for the trimerisation and polymerisation of ethylene
作者:Martin E. Bluhm、Olaf Walter、Manfred Döring
DOI:10.1016/j.jorganchem.2004.09.080
日期:2005.1
Cr(III) complexes of tridendate imine and amine ligands with N, P, O, S donor atoms 1 and 2 have been prepared and tested as catalysts in the oligomerisation and polymerisation of ethylene giving excellent selectivity towards 1-hexene and polymerisation to polyethylene when activated with cocatalysts. X-ray structure analyses of the precatalysts 1a-c, 1i, and 2b are investigated. The metal-ligand binding in 1a and 1b is nearly the same, which leads to similar catalytic activities of these precatalysts. (C) 2004 Elsevier B.V. All rights reserved.
Synthesis of Iron P-N-P′ and P-NH-P′ Asymmetric Hydrogenation Catalysts
作者:Jessica F. Sonnenberg、Alan J. Lough、Robert H. Morris
DOI:10.1021/om5008083
日期:2014.11.24
precatalysts for the asymmetric direct hydrogenation of ketones and imines. Employing related ligand scaffolds, we successfully generated and tested the series of three new precatalysts [Fe(PCy2CH2CH═NCH(R)CH2PPh2)(CO)2Br]BF4 with chirality derived from (S)-amino alcohols with phenyl, benzyl, and isopropyl substituents (R), yielding fairly active and selective systems. For the reduction of acetophenone to (S)-1-phenylethanol