Iron(II) complexes featuring chiral PNNP diferrocene: Synthesis and characterization of potential hydrogenation catalysts

摘要

Chiral non-racemic PNNP biferrocene with either imine or amine nitrogen coordination sites were synthesized. Only the imine-type formed dicationic iron complexes of the type [Fe(PNNP)(NCMe)(2)][BF4](2) and [Fe(PNNP)(NCMe)(CO)][BF4](2). Some of these complexes were found to be active in hydrogenation and transfer hydrogenation reactions but their applicability is limited by moderate-to-low conversion and enantioselectivity. (C) 2016 Elsevier B.V. All rights reserved.