In order to determitle the poirit of preferential attack in electrophilic substitution reactions, the bromination of several 2-and 4-anilinopyrimidines has been studied When the pyrimidine is activated by two amino groups (including the anilino) substitution is favored at the 5-position of the pyrimidine When methyls are the only pyrimidine substituents except for the anilino, the anilino nitrogen appears to direct electrophilic attack with about equal facility to the ...