a method for preparing substituted triazines includes reacting a phenylazoaniline with a cyanuric halide to produce a phenylamino - 1 , 3 , 5 - triazine , which is then reduced to form an aminoanilino - 1 , 3 , 5 - triazine . the aminoanilino - 1 , 3 , 5 - triazine can be alkylated under reducing conditions to produce an n - alkyl - phenylenediamino - 1 , 3 , 5 - triazine such as 2 , 4 , 5 - tris -- 1 , 3 , 5 - triazine , which is useful as an antiozonant in rubber and other polymer formulations .