AbstractAlkaline treatment of 2′‐benzoyl‐2‐(N‐carbophenoxy‐N‐hydroxyamino)‐4′‐chloroacetanilide (10) and its corresponding acetate6afforded respectively 5‐(2‐benzoyl‐4‐chlorophenyl)‐3‐hydroxy‐hydantoic acid (12) and 6‐chloro‐4‐phenylquinazolone (13). A study of the course of the reaction was carried out with the corresponding compounds that are devoid of the 2‐benzoyl group. An elucidation of the rearrangement is based on the isolation and independent sy