4-((3,3,5,5-Tetramethylcyclohexylidene){4-[(trimethylsilyl)ethynyl]phenyl}methyl)phenol (146) (0.175 g, 0.42 mmol) was dissolved in MeOH (10 mL). To this solution was added K2CO3 (0.18 g, 1.26 mmol). The reaction mixture was stirred at room temperature overnight, poured into water (10 mL) and extracted with EtOAc (2×50 mL). The combined organic phase was washed with brine, dried over Na2SO4, filtered, and the filtrate was concentrated to give the crude product as brown solid. The crude product was purified by chromatography on a silica gel column eluted with a gradient from hexanes to 15% EtOAc:hexanes to give 0.14 g (97%) of the title compound 147 as white solid. mp 138-139° C. 1H NMR (400 MHz, CDCl3): δ 0.91 (s, 6H), 0.92 (s, 6H), 1.28 (s, 2H), 1.93 (s, 2H), 1.97 (s, 2H), 3.03 (s, 1H), 4.55 (br s, 1H), 6.73 (d, J=8.5 Hz, 2H), 7.01 (d, J=8.4 Hz, 2H), 7.11 (d, J=8.2 Hz, 2H), 7.39 (d, J=8.2 Hz, 2H). LCMS (ESI): m/z 343 (M−H)−.
