Rotamers of palladium complexes bearing IR active N-heterocyclic carbene ligands: Synthesis, structural characterization and catalytic activities
作者:Han Vinh Huynh、Jiang Wu
DOI:10.1016/j.jorganchem.2008.10.044
日期:2009.2
bearing unsymmetrical cyano- and ester-functionalized NHC ligands as potential IR probes were studied in detail. Direct reaction of Pd(OAc)2 with functionalized imidazolium salts afforded either bis(carbene) (3a, c) or monocarbene complexes (5, 6) with a N-coordinated imidazole co-ligand. The latter were exclusively obtained with N-ethylene substituted salts, which were found to undergo N–C cleavage reaction
作者:Steven D. Bull、Stephen G. Davies、Andrew D. Smith
DOI:10.1039/b107440g
日期:2001.11.15
Addition of two or three equivalents of lithium (S)-N-benzyl-N-α-methylbenzylamide to conjugate acceptors containing two or three α,β-unsaturated ester fragments respectively and subsequent hydrogenolytic deprotection afford homochiral bis- or tris-β-amino esters containing two or three new stereogenic centres in high de and ee.