Unexpected solids from enantiopure cationic palladium complexes and racemic anions: A structural study of chiral non-discrimination
作者:Irmgard Kalf、Ruimin Wang、Ulli Englert
DOI:10.1016/j.jorganchem.2005.11.033
日期:2006.5
combining these cations with racemic mandelate or hydratropate anions, but four less popular products, namely three double salts and a solid solution, were obtained and structurally characterized. For one of the double salts, the alternative ionic compounds based on different stereoisomers of the same residues were synthesized independently: The conventional racemicsolid and both diastereomeric salts
Asymmetric Pnictogen-Bonding Catalysis: Transfer Hydrogenation by a Chiral Antimony(V) Cation/Anion Pair
作者:Jian Zhang、Jun Wei、Wei-Yi Ding、Shaoyu Li、Shao-Hua Xiang、Bin Tan
DOI:10.1021/jacs.1c02808
日期:2021.5.5
Pnictogen-bonding catalysisbased on σ-hole interactions has recently attracted the attention of synthetic chemists. As a proof-of-concept for asymmetric pnictogen-bonding catalysis, we report herein an enantioselective transfer hydrogenation of benzoxazines catalyzed by a novel chiral antimony cation/anion pair. The chiral pnictogen catalyst library could be rapidly accessed from triarylstibine with
Silver-Catalysed Enantioselective Addition of OH and NH Bonds to Allenes: A New Model for Stereoselectivity Based on Noncovalent Interactions
作者:Jannine L. Arbour、Henry S. Rzepa、Julia Contreras-García、Luis A. Adrio、Elena M. Barreiro、King Kuok Mimi Hii
DOI:10.1002/chem.201200547
日期:2012.9.3
complexes to catalyse the enantioselective addition of OH and NHbonds to allenes is demonstrated for the first time by using optically active anionic ligands that were derived from oxophosphorus(V) acids as the sources of chirality. The intramolecular addition of acids, alcohols, and amines to allenes can be achieved with up to 73 % ee. The exploitation of a CH anomeric effect allowed the absolute configuration