Ammonium Chloride → 4-(4,4,4-Trifluoro-but-1-enyl)-cyclohexanecarboxylic acid methyl ester

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A 1.6 M solution of n-butyllithium in hexane (2.5 mL) was added dropwise to a suspension of triphenyl-(3,3,3-trifluoro-propyl)-phosphonium iodide (1.90 g, 3.91 mmol) in tetrahydrofuran (14 mL) at 0° C. The mixture was stirred at 0° C. for 35 minutes, and a solution of 4-formyl-cyclohexanecarboxylic acid methyl ester (605 mg, 3.55 mmol) in tetrahydrofuran (8.0 mL) was then added dropwise to the reaction solution at −78° C. The mixture was stirred for 45 minutes, and a saturated aqueous ammonium chloride solution was then added, followed by extraction with tert-butyl methyl ether. The organic layer was washed with water and a saturated aqueous sodium chloride solution and washed with sodium sulfate. After concentration, the residue was purified by silica gel column chromatography to give 4-(4,4,4-trifluoro-but-1-enyl)-cyclohexanecarboxylic acid methyl ester (657 mg, 67%) as a colorless oily substance and geometric isomer mixture.

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