4-Methoxyphenylboronic acid（Cat No.:R050731）is an aromatic boronic acid featuring a methoxy group at the para (4-) position of the phenyl ring. This compound is widely used in organic synthesis, particularly in Suzuki–Miyaura cross-coupling reactions to form carbon–carbon bonds. The electron-donating methoxy group influences the reactivity of the boronic acid, often enhancing coupling efficiency and selectivity. It is a valuable intermediate in pharmaceutical, agrochemical, and material chemistry applications, contributing to the construction of complex aromatic frameworks, bioactive molecules, and functionalized polymers with tailored electronic or steric properties.