How is 3,5-Dimethoxybenzonitrile (CAS: 19179-31-8) typically synthesized?

3,5-Dimethoxybenzonitrile can be synthesized via the nitrile addition to 3,5-dimethoxybenzene using a nitrating agent like phosphorus pentoxide or diphosphorus pentaoxide. The reaction is typically carried out in an inert atmosphere to prevent oxidation. The yield and selectivity are good, and the method is commonly used in laboratory settings for its simplicity and efficiency.