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J = 10.5 Hz), 4.28 (2H, q, J = 7.1 Hz), 3.59 (2H, s), 3.17
(2H, s), 2.60 (2H, m), 1.32 (3H, t, J = 7.1 Hz), 1.07 (9H, s);
13C NMR (100 MHz, CDCl3): d = 191.0, 161.3, 135.6,
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26.9, 26.6, 19.5, 14.4; IR (neat) mmax: 2848, 2129, 1707,
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we thought that the key ring-opening reaction of 1 should
be examined first.
19. Compound 10: Rf 0.30 (hexane/ethyl acetate = 4/1); 1H
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5.79 (1H, m), 5.68 (1H, dd, J = 9.7, 2.9 Hz), 4.20 (2H, q,