N-Hydroxyisoharnstoffe 1 nehmen Phenylisocyanat an der HOGruppe auf und bilden die OCarbamoylverbindungen 4. Diese konnen zum A2-1,2,4-0xadiazolin-5-on (Sa), zu 3-Imino-1,2,4-oxadiazolidin-5-onen 5b-5e oder zum A3-l,2,4-0xadiazolin-5-on (9dB) cyclisieren. Die aus Sb-Se hergestellten Hydrochloride 6IAe sind zu den 1,2,4-Oxadiazolidin-3,5-dionen 7b-7e verseifbar. Die IR-und MS-Daten von 4,5,6 und 7 werden diskutiert.
Acylalion and Qdization of NHydroxybmrem by Phenyl hcyanateOn adding phenyl isocyanate to the N-hydroxykoureas 1 the 0-carbamoyl derivatives 4 are obtained.They can undergo ring closure to yield A2-1,2,4-oxadiazolin-5-one (Sa), the 3-imino-1,2,4-oxadiazozolidin-5-ones S b S e or A3-1,2,4-oxadiazolin-5-one (9dB). Compounds 5b-Se form the hydrochlorides 6b-6e which can be hydrolized to yield the 1,2,4-oxadiazolidine-3,5-diones 7b-7e. The IR and MS data of compounds 4-7 are discussed.