“…1-(2,4,6-Trimethylphenyl)hexane-2,5-dione (3m): 3:1 hexane/EtOAc; a colorless oil (60%); bp 129 °C/0.2 mmHg, mp 29−31 °C (Et 2 O−hexane) [lit . mp 32 °C]; IR (neat) 1711, 1614, 1486 cm -1 ; 1 H NMR (270 MHz) δ 2.16 (s, 3H), 2.21 (s, 6H), 2.25 (s, 3H), 2.66 (m, 4H), 3.77 (s, 2H), 6.86 (s, 2H); 13 C NMR (68 MHz) δ 20.2 (t), 20.8 (t), 29.8 (t), 35.3 (t), 36.9 (t), 43.9 (t), 128.8 (d), 136.3(s), 136.7 (s), 207.06 (s), 207.09 (s); EI-MS m / z (rel intensity) 232 (M + , 14), 133 (88), 99 (100), 71 (7).…”