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note
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The alternative bridged ring structures could be easily excluded from NMR evidence (absence of upfield signals for the methylene bridge).
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36
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note
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3, 500 MHz). 4a: δ 1.82 (s, 3 H), 1.85 (dd, 1 H, J = 6.0, 14.0 Hz), 2.02 (s, 3 H), 2.18 (dd, 1 H, J = 9.0, 14.0 Hz), 2.92 (m, 1 H), 3.08 (m, 1 H), 3.13 (t, 1H, J = 6.2 Hz), 3.22 (dd, 1 H, J = 3.0, 9.0 Hz), 3.71 and 3.72 (unresolved, 2 H), 3.80 (dd, 1 H, J = 5.5, 12.6 Hz), 3.89 and 3.90 (unresolved, 2 H), 3.95 (d, 1 H, J = 14.0 Hz), 4.00 and 4.02 (unresolved, 2 H), 4.09 (t, 1 H, J = 7.7 Hz), 4.15 (d, 1 H, J = 14.0 Hz), 5.17 (d, 1 H, J = 6.2 Hz), 5.42 (d, 1 H, J = 3.0 Hz), 7.22-7.36 (m, 10 H). 5a: δ 1.79 (s, 3 H), 1.82 (dd, 1 H, J = 7.3, 13.4 Hz), 2.04 (s, 3 H), 2.90 (m, 1 H), 3.05 (dd, 1 H, J = 9.0, 13.4 Hz), 3.17 (m, 1 H), 3.27 (dd, 1 H, J = 5.0, 8.5 Hz), 3.44 (dd, 1 H, J = 4.5, 7.0 Hz), 3.59 (dd, 1 H, J = 4.2, 8.0 Hz), 3.67 and 3.69 (unresolved, 2 H), 3.83 (d, 1 H, J = 13.6 Hz), 3.85 and 3.88 (unresolved, 2 H), 3.92 (d, 1 H, J = 13.6 Hz), 3.98 and 4.00 (unresolved, 2 H), 4.08 (t, 1 H, J = 8.0 Hz), 5.20 (d, 1 H, J = 4.5 Hz), 5.30 (d, 1 H, J = 5.0 Hz), 7.23-7.33 (m, 10 H).
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