“…After the reaction mixture had been stirred for 2 hours at -4O"C, a solution of phosphorus trichloride (1.72 g, 12.5 mmol) in diethyl ether (50 mL) was slowly added at -40°C. The reaction mixture was stirred for 2 hours, warmed to room temper-Phosphoms Trichlori 2 e 1) 4 n-BuLI 1) 3 n-BuLI 1) 4 n-BuLI 1) 3 n-BuLI 2) SOCI, 4 WBr 2, -m-N' / Et20, a B r -40°C, Ar Et20r 1g -4OoC, Ar 2g SCHEME 2 ature, and then mixed with water (100 mL). The solid product was separated from the solution by filtration, washed with water, and dried.…”