Used as a key intermediate in the synthesis of pharmaceuticals, particularly in the development of kinase inhibitors and other bioactive molecules. Its phosphonic acid group allows for strong binding to metal ions and enzymes, making it valuable in medicinal chemistry for mimicking phosphate esters in metabolic pathways. Also employed in materials science for modifying surface properties of metal oxides and in the preparation of functionalized polymers. Its aromatic methoxy group enhances solubility and influences electronic properties, beneficial in designing organic electronic materials.