AbstractThe addition of organolithium reagents to the azomethine bond of 5,6‐disubstituted pyrimidines provided, in every case, a single adduct. When reacted with either ethyl chloro‐formate or hydrogen chloride, these adducts gave a single dihydro pyrimidine. The resulting N‐H dihydro pyrimidines were oxidized with potassium permanganate to the corresponding pyrimidines.