Carbonylation studies of Pd-methyl complexes modified with 1,4-Cs-symmetrical diphosphine ligands
摘要:
Neutral palladium methyl chloride 2a-d [PdCH3((PP)-P-boolean AND')Cl] and cationic palladium methyl acetonitrile mono-triflate 3a-d [PdCH3((PP)-P-boolean AND')(CH3CN)](CF3SO3).complexes were synthesized and fully characterized ((PP)-P-boolean AND' = 1a-d). All the neutral and cationic complexes containing a C-s-symmetric diphosphine exist in solution as a mixture of geometric isomers. The carbonylation at atmospheric pressure of the neutral and cationic complexes revealed that migratory insertion of carbon monoxide is not stereospecific in these systems. The neutral and cationic acyl complexes were formed in situ as mixtures of stereoisomers, which were characterized by means of NMR spectroscopy.The crystal structures of [Pd(1a)Cl](2)(OTf)(2) and 2d are described. (c) 2006 Elsevier B.V. All rights reserved.
The preparation and the characterization of palladium(II) neutral dichloro complexes [PdCl2(P^P′)] 1a–d and cationic disolvento complexes [Pd(P^P′)(H2O)2](OTf)23a–d containing non-symmetrical Cs-symmetrical diphosphines are reported.
NovelCs-Symmetric 1,4-Diphosphine Ligands in the Copolymerization of Propene and Carbon Monoxide: High Regio- and Stereocontrol in the Catalytic Performance
作者:Antonella Leone、Giambattista Consiglio
DOI:10.1002/hlca.200590002
日期:2005.2
New Cs-symmetric aryl 1,4-diphosphineligands were synthesized and tested in the copolymerization of carbonmonoxide and propene. The electronic properties of the two different P-atoms did not affect the high enantioselectivity of the catalyst precursors, thus resulting in high ‘regio’- and ‘stereoregular’ copolymers.
Neutral palladium methyl chloride 2a-d [PdCH3((PP)-P-boolean AND')Cl] and cationic palladium methyl acetonitrile mono-triflate 3a-d [PdCH3((PP)-P-boolean AND')(CH3CN)](CF3SO3).complexes were synthesized and fully characterized ((PP)-P-boolean AND' = 1a-d). All the neutral and cationic complexes containing a C-s-symmetric diphosphine exist in solution as a mixture of geometric isomers. The carbonylation at atmospheric pressure of the neutral and cationic complexes revealed that migratory insertion of carbon monoxide is not stereospecific in these systems. The neutral and cationic acyl complexes were formed in situ as mixtures of stereoisomers, which were characterized by means of NMR spectroscopy.The crystal structures of [Pd(1a)Cl](2)(OTf)(2) and 2d are described. (c) 2006 Elsevier B.V. All rights reserved.