An attempt has been made to prepare aliphatic and aromatic dioyl diisocyanates according to Speziale's method. The reactions of sebac-, phthal-, isophthal-and terephthalamide with oxalyl chloride progressed smoothly, forming the corresponding isocyanate, which in turn gave quantitatively the corresponding bifunctional acylurea on treatment with aniline in all cases except phthaloyl isocyanate. In the reaction of succin-or adipamide, however, the ...
