2-(2-Bromophenyl)acetic acid

In the title molecule, C8H7BrO2, the carboxyl group is twisted by 76.2 (3)° from the benzene ring plane. In the crystal, molecules are linked into inversion dimers through pairs of O—H⋯O hydrogen bonds. The dimers are further linked into layers parallel to the bc plane by weak C—H⋯O hydrogen bonds.

In the title molecule, C 8 H 7 BrO 2 , the carboxyl group is twisted by 76.2 (3) from the benzene ring plane. In the crystal, molecules are linked into inversion dimers through pairs of O-HÁ Á ÁO hydrogen bonds. The dimers are further linked into layers parallel to the bc plane by weak C-HÁ Á ÁO hydrogen bonds.

Comment
The title compound, (I), has many applications in various syntheses, for example, in the synthesis of heterocyclic compounds (Deshpande et al., 2008) and in the synthesis of AMPA antagonists -substituted quinoxalinediones, quinolones, isatinoximes and benzodiazepine derivatives (Pratt et al., 2000). It can also be used in a gas chromatography as a phase transfer catalyst (Rodriguesa et al., 2002). Herein we report its crystal structure.

Experimental
The title compound was purchased from the Spectrochem Ltd., Mumbai. Single-crystals were grown from acetone and toluene(1:1) mixture by slow evaporation method.

Refinement
Atom H8 was found in a difference map and isotropically refined. C-bound H atoms were positioned geometrically (C-H 0.93-0.97 Å), and were treated as riding, with U iso (H) = 1.2U eq (C).

Computing details
Data collection: CrysAlis PRO CCD (Oxford Diffraction, 2010); cell refinement: CrysAlis PRO CCD (Oxford Diffraction, 2010); data reduction: CrysAlis PRO RED (Oxford Diffraction, 2010); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997); software used to prepare material for publication: PLATON (Spek, 2009  Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > σ(F 2 ) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.