The oxygenation of flavonol by copper(I) and copper(II) flavonolate complexes. The crystal and molecular structure of bis(flavonolato)copper(II)

Abstract

Flavonol is oxygenated to the corresponding depside catalysed by Cu¹ and Cu^II flavonolate complexes; X-ray structure determination of bis(flavonolato)copper(II)·2CHCl₃ shows that the two flavonolate ligands are coordinated to Cu^II through their 3-hydroxy and 4-carbonyl groups to result in a square planar geometry around copper(II).