“…Caled: C, 76.94; H, 9.47. Found: C, 76.58; H, 9.34. 6-Butyltetrahydro-4-methyl-4-(l-methylethenyl)-2ffpyran-2-one (13): 72% yield (1:1 mixture of diastereomers); NMR ó 4. 93-4.77 (m, 4H), 4.41-4.39 (m, 1H), 4.20-4.10 (m, 1H), 2.86-2.78 (m, 1H), 2.50-2.45 (m, 2H), 2.27-2.20 (m, 1H), 2.05-1.97 (m, 1H), 1.86-1.77 (m, 1H), 1.75-1.72 (m, 6H), 1.71-1.25 (m, 14H), 1.24-1.17 (s, 3H), 1.16-1.12 (s, 3H), 0.95-0.85 (m, 6H); 13C NMR ó 171.8,171.5,150.4, 147.7, 112.1, 109.4, 77.7, 77.2, 42.0, 41.3, 39.2, 39.0, 38.3, 37.4, 36.5, 35.7, 35.4, 27.8, 27.0, 26.9, 24.6, 22.5, 22.4,18.9,18.8,13.8;IR (neat) 3087, 2956IR (neat) 3087, , 2931IR (neat) 3087, , 2871IR (neat) 3087, , 1735IR (neat) 3087, , 1639IR (neat) 3087, , 1455IR (neat) 3087, , 1380 6-Ethyltetrahydro-4-methyl-4-(l-methylethenyl)-2Ffpyran-2-one ( 14): 58% yield (1:1 mixture of diastereomers); NMR ó 4.…”