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(e) All other adducts 16 have no previously reported optical rotation and the absolute stereochemistry was assumed to be the same as that for 8 and 16ad since the order of the major and minor peaks in the chiral stationary phase HPLC chromatogram and the sign of the optical rotation were the same in all cases.
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30544448691
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note
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3): δ = 7.95 (2 H, d, J = 8.0 Hz), 7.59 (1 H, t, J = 8.0 Hz), 7.47 (2 H, t, J = 8.0 Hz), 7.37-7.27 (5 H, m, Ph), 4.85 (1 H, dd, J = 12.5, 6.5 Hz), 4.70 (1 H, dd, J = 12.5, 7.0 Hz), 4.26 (1 H, qn, J = 6.5 Hz), 3.50 (1 H, dd, J = 17.5, 6.5 Hz), 3.44 (1 H, dd, J = 17.5, 7.0 Hz); all data are consistent with those previously reported. See:
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51
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30544448001
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note
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+: 729.2530; found: 729.2531.
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