Abstract
New chiral PNP and PNHP ferrocene ligands and the corresponding Fe(ii) complexes of PNP ligands with the general formula [Fe(PNP)X2] (X = Cl, Br) were synthesized.
Highlights
At present, platinum metal-based asymmetric catalysis is considered to be a standard methodology in organic synthesis and it is frequently used in both academia and industry
New chiral imine and amine type PNP ligands, all based on diferrocene scaffold, were developed
While the amine type ligands did not coordinate to iron with use of the imine ligands Fe(II) complexes of general formula [Fe(PNP)X2] (X 1⁄4 Cl, Br) were obtained
Summary
Platinum metal-based asymmetric catalysis is considered to be a standard methodology in organic synthesis and it is frequently used in both academia and industry. The study reported here concerns the synthesis of chiral PNP pincer ligands with a ferrocene scaffold (Chart 1) and the structural behavior and reactivity of their corresponding Fe(II) complexes. We recently described a taddol based Fe(II) PNP pincer complex with a 2,6-diaminopyridine backbone where the ligand was coordinated in a k2P,N-fashion.[21] The Fe–P bond length of about 2.4 Ais comparable with those in other high-spin tetrahedral iron(II) complexes.[22]
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