OPPI BRIEFS Volume 32, No. 4, 2000 mixture was stirred at 25" for 24 h, after which time tlc analysis (silica gel; 3: l hexane-EtOAc) showed the reaction to be complete. The orange mixture was partitioned between water (200 mL) and Et, O (200 mL). The ethereal extract was washed with saturated NaHCO,, brine, dried (MgSO,) and concentrated to afford 23.02 g (-100%) of crude 3 as a red oil. IH NMR (CDCI,): 6 8.01 (d, 2 H); 7.46 (d, 2 H); 5.50 ( ...
