Cyclooctapyrroles, novel macrocycles containing biladiene-a,c units

Cyclooctapyrroles, novel macrocycles containing two biladiene-a,c units, were synthesized in high yield from the condensation of 3,3′-dipyrromethanes with 5,5′-diformyl-2,2′-dipyrromethane under acidic conditions. These macrocycles form dinuclear complexes with zinc(II).