Synthesis and characterizations of arsine- and stibine-ligated Schiff base palladacycles and their applications in Suzuki-Miyaura cross-coupling reactions

摘要

A series of arsine- and stibine-ligated Schiff base palladacycles were synthesized by the reaction of -Cl-bridged Schiff base palladacycles [Pd(C6H4CH]NC6H2R)(mu-Cl)](2) (R = 2,4,6-trimethyl or 2,6-diisopropyl) with AsPh3 or SbPh3. The new arsine- and stibine-ligated palladacycles were fully characterized using H-1 NMR, C-13 NMR and infrared spectroscopies, high-resolution mass spectrometry, elemental analysis and single-crystal X-ray diffraction. Further exploration of the catalytic application of the palladacycles for Suzuki-Miyaura cross-coupling reactions of aryl bromides with arylboronic acids was carried out. It was found that the new palladacycles are considerably active for these coupling reactions. Copyright (C) 2016 John Wiley & Sons, Ltd.