in dichloromethane under N2; soln. of C6F5Cu in CH2Cl2 added dropwise over 20 min to soln. of BBr3 (3 equiv) in CH2Cl2 at -78 °C; mixt. stirred at -78 °C for 1 h and then slowly warmed to room temp. and stirred for 3 h; mixt. filtered; volatiles slowly removed at -20 °C under high vac.; crude product distd. under dynamic vac. (DV) at ca. 50°C into cold trap (liq. N2), transferred under static vac. into storage flask and kept under DV at 0°C for 6 h;
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