Used as an intermediate in organic synthesis, particularly in the preparation of pharmaceuticals and agrochemicals. It serves as a protecting group for amines due to the stability of the tert-butoxycarbonyl (Boc) moiety, allowing selective reactions on other functional groups. After the desired transformation, the protecting group can be removed under mild acidic conditions to regenerate the free amine. Its phenyl and tert-butyl groups contribute to lipophilicity, making it useful in modifying solubility properties of synthetic intermediates. Also employed in the development of specialty polymers and as a building block in the synthesis of bioactive molecules.