... Paul R. LePlae, Naoki Umezawa, Hee-Seung Lee, and Samuel H. Gellman* Department of Chemistry, University of ... The organic layer was dried over MgSO4, filtered, and concentrated ... 141 °C (recrystallized from hexane/CH2Cl2); 1H NMR (300 MHz, CDCl3) δ 7.75 (d, J ) 7.4 Hz ...