“…1 H NMR (400 MHz, CDCl3, ppm): δ 1.33 (s, 3H), 1.50 (s, 3H), 2.66-2.74 (m, 2H), 4.81 (d, J ) 3.6 Hz, 1H), 4.83 (d, J ) 4.0 Hz, 1H), 4.95-5.02 (m, 1H), 5.96 (d, J ) 4.0 Hz, 1H). 13 (29). A suspension of 27 (98.9 mg, 0.62 mmol), 3-bromo-1-propynylbenzene (647.7 mg, 3.32 mmol), and indium (286 mg, 2.49 mmol) in 0.1 N hydrochloric acid/ethanol (1:9; 4 mL) was stoppered and stirred vigorously at room temperature overnight.…”