3-Chloro-1,1-diphenylpropene → Methyl 2-(3,3-diphenylprop-2-enylthio)-5-trifluoromethylbenzoate

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A solution of 2.19 g (9.86 mmol) of methyl 2-mercapto-5-trifluoromethylbenzoate, 2.29 g (10.0 mmol) of 1,1-diphenyl-3-chloro-1-propene, and 1.67 g (11.0 mmol) of diazabicycloundecene (DBU) in 10 ml tetrahydrofuran was stirred for 60 minutes at room temperature. The solution was partitioned between ether and water and the ether layer was washed with water, dried over MgSO4 and evaporated. The residue was chromatographed (20% CH2Cl2 -hexane) on silica to afford 3.6 g (85%) of a clear oil. NMR (CDCl3, 90 MHz) 3.67 (d, 2H, J=8, CH2), 3.92 (s, 3H, --OCH3), 6.05 (t, 1H, J=8), 6.9-7.6 (m, 12H), 8.13 (s, 1H).

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