摘要:
A series of new cationic cyclopalladated complexes 2-6 have been synthesized from neutral cyclopalladated complex 1 of p-tert-butyl-calix[4] arene bisphosphite with various nitrogen donor ligands (acetonitrile, pyridine, aniline, (R)-(+)-1-phenylethylamine and 4,4'-bipyridine) in presence of Ag(OSO2CF3) as a chloride scavenger. These cationic cyclopalladated complexes have been characterized by NMR spectroscopy. Single crystal X-ray diffraction studies performed on cationic cyclopalladated complexes 3 and 6 in solid state reveal nearly square planar geometry around the metal and distorted cone conformation of the calix[4] arene framework. These cationic cyclopalladated complexes based on hetero ligands having variable steric and electronic properties could be efficient catalysts for important organic transformation reactions. (C) 2011 Elsevier B. V. All rights reserved.