... The Journal of Organic ... The organic layers were then combined, dried over Na 2 SO 4 , filtered, and concentrated. ... EtOAc/n-hexanes (1/1) as the eluant: white solid; yield = 2.37 g (87%); mp 172–174 °C; [α] D 27 −4.0 (c = 1, MeOH); 1 H NMR(34) (MeOH-d 4 ) δ 7.68 (d, J = 7.4 Hz ...