Cu(II)-assisted oxidation of quinoline-2-carbaldehyde hydrazone to give [1,2,3]triazolo[1,5-α]quinoline: The first example of Cu(I) complex containing [1,2,3]triazolo-ligand

The ORTEP drawing of Cu(I) complex 1: the in situ formation of [1,2,3]triazolo[1,5-α]quinoline and the change of oxidation state of copper salts linked to the catalytic function of Cu(II).