Chiral and Achiral Bis（2-oxazolinylphenolato）nickel（Ⅱ） Complexes-Synthesis, Crystal Structure, and Catalytic Properties

Introduction Oxidation was a very important reaction both in synthetic pathways and in industrial processes. Metal-catalyzed oxidation provided excellent alternatives in synthetic processes. However, molecular oxygen has been applied only in a limited number of metal-catalyzed oxidations, because it was very difficult to activate molecular oxygen and most of transition metal complexes were sensitive to oxygen. It was noted that metal-catalyzed Baeyer-Villiger oxidation was a convenient method…

Chiral and achiral bis(2‐oxazolinylphenolato)nickel(II) complexes—synthesis,crystal structure,and catalytic properties

A series of chiral and achiral bis(2‐oxazolinylphenolato)nickel@) complexes 2 were synthesized by reactions of various 2‐(4, 5dihydro‐2‐oxazolyl)phenol derivatives with nickel chloride hexahydrate. The molecular structure of complex 2a was determined by X‐ray single crystal diffraction. The crystal of complex 2a was monoclinic, space group P2₁ with cell dimension of a= 1.1121(4) nm, b=0.9472(3) nm, c=1.4113(5) nm, α=γ=90°,β=91. 450(6)°, V=1.4861(8) nm³, Z=2, and μ=0.693 mm^?1. In the solid state, the nickel(II) ion was in a square‐planar coordination geometry. The catalytic activities of complexes 2 in Baeyer‐Villiger reaction with molecular oxygen were investigated.