Synthesis
General procedure for the synthesis of 2-fluoro-5-nitrophenylacetic acid from o-fluorophenylacetic acid: o-fluorobenzoic acid (30.0 g, 0.19 mol) was dissolved in a mixed solution of concentrated sulfuric acid (50 mL) and water (10 mL). A mixed solution of fuming nitric acid (10 mL) and water (10 mL) was added slowly and dropwise at 0 °C. The reaction mixture was kept stirred at 0 °C for 30 min. Upon completion of the reaction, the resulting precipitate was collected by filtration and washed with cold water. Finally, the product was dried under vacuum to afford 2-(2-fluoro-5-nitrophenyl)acetic acid as a white solid (35.2 g, 91% yield).
References
[1] Patent: WO2010/91310, 2010, A1. Location in patent: Page/Page column 99
[2] Journal of the Chemical Society - Perkin Transactions 1, 1997, # 15, p. 2229 - 2235
[3] Tetrahedron, 2000, vol. 56, # 50, p. 9809 - 9818
[4] Patent: US2006/30609, 2006, A1. Location in patent: Page/Page column 15
