3-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)phenol, commonly referred to as TMDP, is a chemical compound categorized under phenolic boronic esters. Its molecular structure comprises a phenolic hydroxyl group attached to a phenyl ring bearing a boron-containing cyclic ester moiety with four methyl groups. This compound holds significant importance in organic synthesis, especially in Suzuki-Miyaura cross-coupling reactions, where it serves as a crucial boronic ester reagent. Additionally, its stable cyclic boronate structure and steric hindrance make it valuable in ligand design for transition metal-catalyzed reactions and in the development of functional materials.