“…purified by column chromatography, using a column of 32 X 3 cm packed with 100-200 mesh silica gel, and n-hexane as eluent: ir µ61" 3080, 2945, 1495, 758, 725, 700 cm'1; nmr (100 MHz, CCh) S 1.22 (d, J = 7.0 Hz, 3, CH,), 1.35 (s, 3, CH,), 1.59 and 1.72 (d, 1, CH), 2.04-2.13 (two sets of q, 1, CH), 2.50-2.88 and 3.10-3.33 (both m, 4, benzylic), and 6.64-7.27 ppm (m, 8, aromatic); mass spectrum m/e (rel intensity) 248 (100), 249 (24), 233 (70), 205 (27), 119 (26), 91 (9); mass, caled for CioH20, 248.1565 (found, 248.1567).…”