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8 Spectral data for 8h:
colorless oil; R
f = 0.5
(hexane/EtOAc = 2:1); 1H NMR
(250 MHz, CDCl3): δ = 5.64-5.53
(m, 2 H), 4.10-4.02 (t, J = 5.6
Hz, 2 H), 3.44-3.35 (t, J = 6.0
Hz, 2 H), 2.48-2.32 (m, 2 H), 2.36-2.24 (m, 2
H), 1.79-1.68 (m, 2 H), 1.49 (s, 9 H); 13C
NMR (62.9 MHz, CDCl3): δ = 158.3, 130.8,
128.3, 81.2, 72.6, 52.7, 28.6, 26.2, 25.9, 23.0; IR (film, cm-1)
2971, 2931, 1729, 1709, 1459, 1393, 1368, 1337, 1164, 1123, 1082;
MS: m/z (rel. intensity): 18
(7), 29 (10), 41 (20), 57 (100), 69 (7), 83 (8), 96 (15), 110 (3),
127 (10), 207 (M
+
,
1).
