Several novel 2-benzoxazolitiones (IV) containing tlie fluoro, trifluoromethyl, arid iodo groups were investi-gated. I'or the most part the"-berizoxazoliIiones described in this paper were substituted in t, he 5 posit'ioii und were prepared from corresponding 4-suhstitutc~ l'I- aminophenol (VI) either by fiision with ure: tIn or reaction wit'h phosgene."