[C:1]([C:5]1[O:9][C:8]([CH:10]2[CH2:12][CH:11]2[C:13]([O:15]CC)=[O:14])=[CH:7][CH:6]=1)([CH3:4])([CH3:3])[CH3:2].[OH-].[K+].Cl.[Cl-].[Na+]>CO.O>[C:1]([C:5]1[O:9][C:8]([CH:10]2[CH2:12][CH:11]2[C:13]([OH:15])=[O:14])=[CH:7][CH:6]=1)([CH3:4])([CH3:2])[CH3:3]Ethyl 2-(5-t-butylfuran-2-yl)-cyclopropanecarboxylate (5.0 g, 0.021 mol) was dissolved in methanol (50 ml) and a solution of potassium hydroxide (2.4 g, 0.043 mol) in water (50 ml) was added dropwise at room temperature. The solution was refluxed for 3 hours, cooled to room temperature and carefully neutralised with 2M HCl. Saturated sodium chloride was added, the aqueous solution extracted with ethyl acetate (4×50 ml) and dried over anhydrous sodium sulphate. Removal of the solvent gave 2-(5-t-butylfuran-2-yl)-cyclopropanecarboxylic acid (4.4 g, 100%).
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