A new series of new imidazolones 3-6 have been achieved via the reaction of the readily obtainable 5-oxazolone 2 with 4-aminophenol, ethyl 4-aminobenzoate, 4-aminoacetophenone and 2-aminobenzoic acid as primary aromatic amines in acetic acid including freshly melted sodium acetate. Furthermore, the imidazolone 3 on reaction with ethyl 2-chloroacetate, acetic anhydride, benzoyl chloride or benzenesulfonyl chloride afforded the corresponding imidazolone derivatives 7-10. The newly imidazolone derivatives have been established by spectral data and elemental analysis