The condensation of primary amines with aldehydes or ketones gives products known as imines or Schiff bases which contain a C=N group. Metal complexes of Schiff bases have contributed widely to the inorganic chemistry of chelate system. The extreme Это и многое другое вы найдете в книге Transition metal complexes of benzopyran-4-one Schiff bases (Nora S. Abdel-Kader and Aida L. El-Ansary)