Used as a key intermediate in the synthesis of agrochemicals and pharmaceuticals, particularly in the development of herbicides and fungicides. Its reactive aldehyde and chlorine groups allow for selective modifications, enabling the construction of complex heterocyclic systems. Commonly employed in condensation and nucleophilic substitution reactions to introduce the pyrimidine scaffold into active ingredients. Also utilized in the preparation of dyes and functional materials due to its electron-deficient aromatic ring, which supports charge-transfer interactions.