Efficient polymer light-emitting diodes (PLEDs) based on chiral [Pt(C^N)(N^O)] complexes with near-infrared (NIR) luminescence and circularly polarized (CP) light
Highly diastereoselective pinacol coupling of aldehydes catalyzed by titanium-Schiff base complexes
摘要:
A new effective methodology for a highly diastereoselective pinacol coupling of aldehydes is described. The method employes 3 mol % of a complex prepared in situ from TiCl4(THF)(2) and a Schiff base in acetonitrile. The catalytic cycle is realized with Me3SiCl and Mn as reducing agent. The dependence of the diastereoselectivity on the Schiff base used is reported. (C) 1999 Elsevier Science Ltd. All rights reserved.
Highly efficient and convenient asymmetric hydrosilylation of ketones catalyzed with zinc Schiff base complexes
作者:Shuai Liu、Jiajian Peng、Hu Yang、Ying Bai、Jiayun Li、Guoqiao Lai
DOI:10.1016/j.tet.2011.12.054
日期:2012.2
ligands derived from α-amino acids were prepared, and zinc complexes with these chiral Schiff base ligands prepared were tested for the catalytic asymmetric hydrosilylation of ketones, and the results showed that excellent ee values were obtained, which are the prominent examples of catalytic asymmetric hydrosilylation of ketones catalyzed with zinc complexes in the presence of readily available and inexpensive
New chiral Schiff base–Cu(II) complexes as cyclopropanation catalysts
作者:Ana L. Iglesias、Gerardo Aguirre、Ratnasamy Somanathan、Miguel Parra-Hake
DOI:10.1016/j.poly.2004.09.007
日期:2004.12
A series of chiral Schiff base ligands 1-4, derived from (1R,2S)-(+)-cis-1-amino-2-indanol and other chiral amines with substituted salycilaldehydes were synthesized and transformed to the corresponding CU(II) complexes. Molecular structures of six Cu(II) complexes were determined by X-ray crystallographic studies. The structures show the metal ion in a distorted square planar geometry with dimeric or monomeric structures, depending on the ligand denticity. The potential use of these complexes in asymmetric Cyclopropanation was explored. (C) 2004 Elsevier Ltd. All rights reserved.
Synthesis, crystal structure and solution properties of a diastereomeric (p-cymene)ruthenium(II) chiral Schiff base complex
作者:Rakesh K Rath、Munirathinam Nethaji、Akhil R Chakravarty
DOI:10.1016/s0277-5387(02)01104-x
日期:2002.8
The reaction of [Ru(eta(6)-p-cymene)Cl-2](2) with the chiral Schiff base (S)-(alpha-methylbenzyl)-3,5-di-t-butylsalicylaldimine (HL*) in the presence of NEt3 in CH2Cl2, forms a diastereomeric mixture of (R-Ru, S-C)- and (S-Ru , S-C)-[Ru(eta(6)-p-cymene)(L*)Cl] (1a, 1b). The crystal structure of the complex shows the presence of both the diastereomers in 1:1 ratio in the triclinic space group P1. Both the structures exhibit the presence of a non-covalent CH-pi interaction involving two p-cymene ring protons and the phenyl group attached to the chiral carbon. The H-1 NMR spectra of the complex in CDCl3 display the presence of two diastereomers in a 88:12 ratio at room temperature. The absolute configuration of the major diastereomer in solution has been determined by 2D NOE measurements. Observation of NOE cross peaks involving the C*-H and the p-cymene ring protons indicates a (R-Ru - S-C)configuration of the major diastereomer in solution. (C) 2002 Elsevier Science Ltd. All rights reserved.