Hydrochloric Acid → 1-Pyridin-2-yl-cyclopentanecarboxylic acid

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In a sealed tube 1-pyridin-2-yl-cyclopentanecarbonitrile (3) (10 g, 58.14 mmol) and HCl (12N; 70 mL) were added at room temperature and the reaction mixture was stirred at 90° C. for 16 h while silica thin layer chromatography was performed (20% ethyl acetate/Hexane; Rf=0.1). The reaction mixture was concentrated; an azeotropically distilled with toluene and the residue was triturated with ether to get 1-pyridin-2-yl-cyclopentanecarboxylic acid (431) (10.5 g, 94%) as a white solid.

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