Abstract 4-Methoxy-N, N'-dithiobenzoyl-m-phenylendiamine (dithioamide) has been subjected to oxidation with potassium ferricyanide. By using the equimolar amounts of dithioamide and ferricyanide only a partially cylized compounds has been obtained, whereas when the great amount of ferricyanide is used the cyclization is completed. The structures of the oxidative products as well as of the parent compounds are studied by ...