How is 1-Fluoro-4-isocyanatobenzene (CAS: 1195-45-5) typically synthesized?

1-Fluoro-4-isocyanatobenzene is typically synthesized by the reaction of 4-chloro-1-fluorobenzene with sodium azide in an aprotic solvent like dimethylformamide (DMF) in the presence of a catalyst such as potassium carbonate. The reaction involves the displacement of the chlorine with an azide group, followed by the conversion of the azide to an isocyanate. This method provides good yield and selectivity.