Pyrazole-Based Ligands for the [Copper-TEMPO]-Mediated Oxidation of Benzyl Alcohol to Benzaldehyde and Structures of the Cu Coordination Compounds

摘要

New pyrazole-based ligands have been designed,and the catalytic performances of their copper(II)complexes for the [copper/TEMPO]-mediated oxidation of benzyl alcohol to benzaldehyde have been examined.The pyridine-pyrazole ligands give efficient catalysts,while the use of naphthol-pyrazole ligands results in inactive catalytic systems.Single-crystals of four Cu coordination compounds obtained from pyridine-pyrazole ligands and a free ligand have been isolated and were characterized by X-ray diffraction.Thus,the solid-state structures of three copper(II)complexes are described,together with a copper(I)coordination chain,exhibiting luminescent properties.