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1H NMR (300 MHz, CDCl3): d = 1.36 (t, 3 H, J = 9 Hz), 3.65
(s, 2 H), 4.35 (q, 2 H, J = 9 Hz), 5.98 (s, 1 H), 6.23 (s, 1 H),
7.25 (m, 5 H). 13C NMR (75.5 MHz, CDCl3): d = 14.0, 35.7,
62.2, 126.5, 128.6, 129.2, 133.1, 137.6, 144.4, 163.9, 188.1.
MS: m/z (%) = 218 (5) [M+], 189 (4), 145 (43), 117 (100),
115 (76), 91 (40), 65 (18), 51 (19).
Spectroscopic Data for Ethyl 2-Methylene-3-oxo-3-
phenylpropionate(2)
1H NMR (300 MHz, CDCl3): d = 1.10 (t, 3 H, J = 7.1 Hz),
4.19 (q, 2 H, J = 7.2 Hz), 6.2 (s, 1 H), 6.65 (s, 1 H), 7.44 (d,
2 H, J = 7.2 Hz), 7.52 (t, 1 H, J = 7.3 Hz), 7.84 (d, 2 H,
J = 7.2 Hz). 13C NMR (75.5 MHz, CDCl3): d = 14.0, 61.5,
128.5, 129.4, 131.3, 133.5, 136.3, 141.5, 164.0, 193.0. MS:
m/z (%) = 204 (11) [M+], 175 (13), 158 (12), 130 (11) 105
(100), 77 (99), 51 (62).
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Spectroscopic Data for 2-Methylene-3-phenylpropan-
aldehyde (6)
1H NMR (300 MHz, CDCl3): d = 3.6 (s, 2 H), 6.05 (s, 1 H),
6.1 (s, 1 H), 7.47 (m, 5 H), 9.61 (s, 1 H). 13C NMR (75.5
MHz, CDCl3): d = 34.1, 126.4, 128.5, 129.1 135.1, 138.1,
149.7, 193.9. MS: m/z (%) = 146 (38) [M+], 145 (35), 128
(19), 117 (73), 116 (80), 115 (95), 103 (10), 91 (95), 78 (58),
65 (80), 50 (95), 40 (100).
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Synlett 2009, No. 1, 75–78 © Thieme Stuttgart · New York