number of a-hydroxy isocyanates, a new class of compounds, have been synthesized from isocyanic acid and carbonyl compounds such as formaldehyde, chloral, s- dichlorotetrafluoroacetone, trifluoroacetaldehyde, and perfluorocyclobutanone. These novel isocyanates undergo most of the normal isocyanate reactions. They can be converted readily to 1, 3, 5-oxadiazine-2, 4-diones and to a-chloro isocyanates, an unusually ...