SN 2 is widely utilized in organic synthesis as a nucleophilic substitution mechanism, particularly for the replacement of leaving groups in alkyl halides. It is favored in reactions where a strong nucleophile attacks the electrophilic carbon center, leading to an inversion of configuration at the carbon atom. This mechanism is commonly applied in the preparation of pharmaceuticals, agrochemicals, and fine chemicals, where precise control over stereochemistry is crucial. Additionally, SN 2 reactions are employed in the synthesis of polymers, dyes, and other complex organic molecules, making it a fundamental tool in industrial and laboratory settings.