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To a solution of PPh3 (1.57 g, 5.99 mmol) in Et2O (30 mL) was added BrCH2CN (0.42 mL, 6.0 mmol). The reaction was stirred at reflux for 17 hours. The solvent was removed under reduced pressure, the residue was suction filtered from a small portion of ice-cold Et2O, and washed with a small amount of cold Et2O, giving the phosphonium salt as a white powder (1.05 g, 2.74 mmol, 46%). 1H NMR (CDCl3) δ 6.39 (d, 2H, J=15.3 Hz), 7.69-7.76 (m, 6H), 7.82-7.87 (m, 3H), 7.96-8.03 (m, 6H).

1. temperatureat reflux for 17 hours
2. customThe solvent was removed under reduced pressure
3. filtrationfiltered from a small portion of ice-cold Et2O
4. washwashed with a small amount of cold Et2O