Palladium( ii ) complexes with planar chiral ferrocenyl phosphane–(benz)imidazol-2-ylidene ligands
Articles > Article · 2013
Authors: Pauline LOXQ, Nathalie DEBONO, Süleyman GÜLCEMAL, Jean-Claude DARAN, Eric MANOURY, Rinaldo POLI, BEKİR ÇETİNKAYA, Agnes LABANDE
New J. Chem., Journal Indexed in SCI Expanded, International, WoS, 2013, vol 38, pp 338-347
DOI: 10.1039/c3nj00863k
Summary
We describe here the first examples of planar chiral ferrocenyl phosphane–benzimidazol-2-ylidene ligands and their coordination chemistry with palladium(II). All ligand precursors, namely enantiopure ferrocenyl phosphane–(benz)imidazolium salts, and all enantiopure palladium complexes have been fully characterised by 1H, 31P and 13C NMR, mass spectrometry and X-ray diffraction methods for seven examples. The potential of these very bulky bidentate ligands in catalysis was evaluated and compared to their imidazol-2-ylidene analogues. The influence of sterics was shown to be non-negligible as the bulkiest ligand gave the lowest activities in the asymmetric Suzuki–Miyaura reaction.