Synthesis and Structures of Two Dinuclear Transition Metal Complexes and Their Catalytic Applications in Hydrogenation of Ketones

Abstract

The complexes [Ni 2 (L) 2 ] 2 ·H 2 O (1) and [Cu 2 (L) 2 (H 2 O)]· 2CH 3 OH (2) were prepared by reaction of the chiral Schiff base ligand N-[(1R,2S)-2-hydroxy-1,2-diphenyl]-acetylacetonimine (H 2 L) with Ni II and Cu II ions, respectively, aiming to develop economically and environmentally-friendly catalysts for the hydrogenation of ketones. They have a dinuclear skeleton with axial vacant sites. The catalytic effects of the two complexes for hydrogenation of ketones were tested using dihydrogen gas as hydrogen source. They present some catalytic

Assessment of density functional approximations for calculation of exchange coupling constants in thiocyanato and cyanato double bridged binuclear Ni(II) complexes

“…Due to important and versatile applications in industry, medicine, and technology, various bi-and polynuclear transition metal (TM) based magnetic materials have been investigated. [1][2][3][4][5] These kinds of complexes are characterized by two or more paramagnetic metal centers, often bridged through one or more small ligands. The partially filled d-orbitals of TM centers lead to ferromagnetic (FM) or antiferromagnetic (AF) exchange coupling.…”

Distinct Promotive Effects of 1,8‐Diazabicyclo[5.4.0]undec‐7‐ene (DBU) on Polymer Supports in Copper‐Catalyzed Hydrogenation of C=O Bonds

“…Since the trailblazing development of Stryker's reagent, Cu hydrides with phosphine ligands and their precursors have been known to offer a versatile option for hydrogenation catalysts amenable to broad unsaturated functionalities . Selective transformations like alkynes to Z ‐alkenes, aldehydes/ketones to alcohols, and 1,4‐reduction of α,β‐unsaturated carbonyl compounds have been demonstrated by using these phosphine‐Cu systems. NHC‐Cu complexes (NHC=N‐heterocyclic carbene) have also emerged as a new family of hydrogenation catalysts for the semi‐reduction of alkynes…”