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A series of 5-fluoro-N4-(3-(4-substitutedbenzylamino)phenyl)-N2-(4-morpholinophenyl) pyrimidine-2,4-diamine derivatives 7a-J were prepared and tested for their larvicidal activity against third instar larvae at 24, 48 and 72 hours and values were compared with Malathion as a positive control. Compounds 7a, 7c, 7f, 7g and 7i exhibited good larvicidal significant activity. Interestingly, compounds 7b, 7d, 7e, and 7h showed excellent activity very likely due to the presence of functional groups attached to the benzyl ring.