Patent ID: 7649096

Claim:
A process for preparing a crystalline form of linezolid comprising (a) providing a solution comprising linezolid in an organic solvent wherein the organic solvent is selected from the group consisting of a chlorinated solvent, alcoholic solvent, aliphatic or cyclic ether and mixtures thereof; (b) adding an anti-solvent, wherein the anti-solvent is selected from the group consisting of o-xylene, m-xylene, p-xylene, mesitylene, diphenyl ether, n-heptane and mixture thereof to the solution; and (c) recovering the crystalline form of linezolid; wherein the crystalline form of linezolid is characterized by a powder x-ray diffraction (XRD) pattern substantially in accordance with FIG. 1 and/or an infra red (IR) spectrum substantially in accordance with FIG. 2 .