Some derivatives of 5,5‐diphenylhydantoin (phenytoin) were synthesized by the alkylation of phenytoin with substituted methylene bromides. The hydantoins were evaluated for possibleanticonvulsant activity in the maximal electroshock (MES)‐ and subcutaneous pentylenetetrazole (ScMet)‐induced seizures and for neurotoxicity in the rotorod test in mice and rats.