[CH3:1][Si:2]([CH3:7])([CH3:6])[CH2:3][CH2:4][SH:5].[H-].[Na+].[F:10][C:11]1[CH:16]=[C:15]([C:17]([OH:26])([C:22]([F:25])([F:24])[F:23])[C:18]([F:21])([F:20])[F:19])[CH:14]=[C:13](F)[CH:12]=1.O>CN(C=O)C>[F:10][C:11]1[CH:16]=[C:15]([C:17]([OH:26])([C:18]([F:19])([F:20])[F:21])[C:22]([F:24])([F:25])[F:23])[CH:14]=[C:13]([S:5][CH2:4][CH2:3][Si:2]([CH3:7])([CH3:6])[CH3:1])[CH:12]=12-Trimethylsilylethane thiol (2.9 g, 21.9 mmol) was added dropwise to a suspension of NaH (1.8 g, 43.8 mmol) in dry DMF (60 mL) and stirred for 20 min. Then 1,3-difluoro-5-(hexafluoro-2-hydroxyprop-2-yl)benzene (Step 1 ) was added in dry DMF and the resulting reaction mixture was heated at 70° C. for 16 h. The reaction mixture was then added carefully to H2O and extracted with EtOAc. The combined organic phases were washed with brine, dried and evaporated to give a residue which was chromatographed on silica gel, eluting with 95:5 mixture of hexane:EtOAc to afford the title compound (3.2 g, 55%).
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