The chemistry of pyrrolic compounds. IX. The synthesis of 5,5'-diformyldipyrrylketones and their derivatives

Abstract

Treatment of 5,5'-diformyldipyrrylmethanes with bromine followed by sulphuryl chloride yields 5,5'-diformyldipyrrylketones. Also, this type of product, or the acetoxymethyl derivative, can be obtained in certain cases by the lead tetraacetate oxidation of 5,5'-dimethyldipyrrylketones.