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- Satisfactory elemental analysis and spectral data were obtained for all new compounds. Selected physical properties and spectral data. 2: m.p. 109–110°C (hexane) lit5 108–110°C. [α]D 20 - 28.5(c, 1; CHCl3) lit5–31.5°(c, 0.089, CHCl3), ir (KBr) 2935, 1730, 1245, 1025 cm−1. 1H nmr (100 MHz, CDCl3, δ ppm) 0.7(s, 3H), 0.82(s, 6H, 2×CH3), 1.27(s, 3H), 2.6(m, 2H). 3: m.p. 145–147°C (CHCl3); [α]D 20 + 18°(c, 1; CHCl3) ir (KBr) 3400–3200, 2940, 1100; 1H mnr 0.82(s, 3H), 0.86(s, 3H), 0.95(s, 3H, CH3), 1.1(s, 3H), 3.70(m, 2H)