... (b) Patai, S.; Rappoport, Z. The Chemistry of Alkenes ... The combined organic extracts were dried over anhydrous MgSO, and evaporated to afford the crude product as a colorless oil. ... following: IR (film) 1732, 1651, 1597,1322,1286,1146 cm-'; 'H NMR (200 MHz) 6 7.67 (d, J = 8 Hz ...