Reaction Steps
Under the conditions described in example 1, titanium(IV) chloride (91 g, 0.5 mol), 2-methyl-4-(2,6,6-trimethylcyclohex-1-enyl)butanal 4 (50 g, 0.24 mol) and diethyl malonate (39.7 g, 0.24 mol) in tetrahydrofuran and tetrachloromethane are reacted which each other to give after work-up and short-path-distillation 70.1 g (83%) of 3b. Analytical data: 1H-NMR (400 MHz, CDCl3): δ 0.97 (s, 6 H), 1.1 (d, 3 H), 1.25-1.6 (6 H), 1.3 (2t, 6 H), 1.58 (s, 3 H), 1.8-2.0 (2 H), 2.55 (m, 1 H), 4.15-4.35 (2q, 4 H), 6.8 (d, 1 H) ppm. 13C-NMR (400 MHz, CDCl3): δ 14.0 (q), 14.15 (q), 19.5 (t), 19.6 (q), 19.8 (q), 26.5 (t), 28.5 (q), 32.7 (t), 34.85 (s), 35.6 (d), 36.9 (t), 39.8 (t), 61.1 (t), 61.15 (t), 127.0 (s), 127.5 (s), 136.9 (s), 153.9 (d), 164.0 (s), 165.7 (s). MS (EI): m/z (%) 350 (M+, 4), 335 ([M-15]+, 3), 305 (4), 289 (5), 259 (9), 243 (11), 215 (8), 200 (98), 190 (18), 187 (11), 175 (16), 173 (27), 167 (18), 154 (100), 135 (30), 123 (42), 122 (30), 121 (39), 109 (19), 108 (60), 107 (32), 105 (19), 95 (52), 93 (34), 91 (25), 81 (40), 79 (30), 77 (15), 69 (21), 67 (26), 55 (36), 41 (32), 29 (28). JR (film): 2950 (m), 2960 (m), 2930 (m), 2862 (m), 1725 (s), 1645 (w), 1455 (m), 1375 (m), 1325 (w), 1250 (s), 1222 (s), 1205 (s), 1180 (m), 1170 (m), 1100 (m), 1050 (m), 1030 (m), 950 (w), 865 (w), 800 (w), 765 (w).
