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Ruhemann et al. [Chem. Ber. 30, 2022 (1897)] prepared 2-phenyl-4-pyrimidinamine by reacting 4-chloro-2-phenylpyrimidine with ammonia. The 4-chloro-2-phenylpyrimidine had been prepared in two steps by first reacting benzamidine with sodium formylacetate to produce 2-phenyl-4-pyrimidone and then reacting the latter with phosphorus oxychloride.