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0 °C

780 mg (2.2 mmol) of 6-benzyloxy-5-tert-butyl-4′-methyl-3-biphenylcarbaldehyde are dissolved in 50 mL of THF, and the reaction medium is cooled to 0° C. 5.7 mL (2.8 mmol) of 0.5 M ethynylmagnesium bromide solution are added slowly. The medium is stirred at 0° C. for 2 hours and the reaction is then treated with a saturated ammonium chloride solution. The residue obtained is purified by chromatography on a column of silica (eluent: 9 heptane/1 ethyl acetate). A yellow oil is obtained (m=740 mg; yield=89%).

1. customThe residue obtained
2. customis purified by chromatography on a column of silica (eluent: 9 heptane/1 ethyl acetate)
3. customA yellow oil is obtained (m=740 mg; yield=89%)