Alkaline-earth metal complexes of macrocyclic Schiff bases derived from furan-2,5-dicarbaldehyde

Abstract

Novel alkaline-earth metal complexes of macrocyclic Schiff bases are formed by the metal-induced condensation of furan-2,5-dicarbaldehyde with 3,6,9-trioxaundecane-1,11-diamine or 1,5-bis(2-aminophenoxy)-3-oxapentane in alcoholic media. In the absence of the metal cation the macrocycles are formed in little or no yield. Magnesium is ineffective in promoting the synthesis of these macrocycles.