2-(3-Bromo-4-meth­oxy­phen­yl)acetic acid

The title compound C(9)H(9)BrO(3), was synthesized by the regioselective bromination of 4-meth­oxy­phenyl­acetic acid using bromine in acetic acid in a 84% yield. In the mol­ecular structure, the meth­oxy group is almost coplanar with the phenyl ring within 0.06 Å; the acetic acid substituent is tilted by 78.15 (7)° relative to the ring. The C—C—C angles at the OMe, acetyl and Br substituents are 118.2 (2), 118.4 (2) and 121.5 (2)°, respectively, indicating that the Br atom is electron-withdrawing, whereas the other substituents possess electron-donating properties. In the crystal, the mol­ecules form centrosymmetric strongly O—H⋯O hydrogen-bonded dimers of the type R (2) (2)(8).