4-chloro-5-fluoropyrimidine

4-chloro-5-fluoropyrimidine is a halogen-substituted pyrimidine derivative widely used as a chemical intermediate in organic and medicinal chemistry. It contains a pyrimidine ring (a nitrogen-containing heterocycle) substituted with a chlorine atom at position 4 and a fluorine atom at position 5, which makes it highly reactive for nucleophilic substitution reactions. Because of these reactive halogens, it serves as a key building block in the synthesis of various pharmaceutical compounds, including antiviral, anticancer, and antifungal agents, where controlled modification of the heterocyclic core is required.