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- trans,-12 : colorless oil, Rf ,= 0.42 (diethyl ether-pentane, 1:9); [α]578 26 +109 (c, 0.4 in CHCl3); vmax , (film)/cm−1 2970, 2930, 2860 and 1740; δH(400 MHz; CDCl3) 5.77 (1H, ddd, J, 17.1, 10.3 and 7.5), 4.97 (1H, dt, J, 17.1 and 1.5), 4.95 (1H, ddd, J, 10.3, 1.5 and 1.1), 2.67 (1H, m), 2.25 (1H, m), 2.03 (3H, m), 1.68 (1H, ddd, J, 9.3, 4.0 and 1.5), 1.33 (1H, m), 1.12 (3H, d, J, 6.3) and 1.07 (3H, d, J, 7.1); δC(100 MHz; CDCl3) 220.4, 141.3, 114.4, 61.5, 38.7, 37.1, 33.9, 29.7, 21.1 and 17.5; Anal. Calcd. for C10H16O: C, 78.95; H, 10.53. Found: C, 78.92; H, 10.58