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Acknowledgements
This research was assisted financially by KOSEF (Korea Science and Engineering Foundation, 971-
0302-012-2 and 98-05-01-04-01-3).
References
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24
13. Spectral data for 2. Rf=0.49 (EtOAc:n-hexane, 1:20); [α]D –7.692 (c 0.26, CHCl3); FT-IR (CDCl3) 3443.15 (OH),
1
2926.15, 2855.81, 1717.09; H NMR (500 MHz) δ 7.260 (d, J=8.5 Hz, 2H), 6.865 (d, J=8.5 Hz, 2H), 4.614 (m, 1H),
4.553 (d, J=11 Hz, 1H), 4.337 (d, J=11.5 Hz, 1H), 4.157 (m, 1H), 3.798 (s, 3H), 3.762 (dd, J=9.5, 4 Hz, 1H), 3.729 (d, J=4.5
Hz, 1H), 3.389 (dd, J=9.5, 8 Hz, 1H), 2.950 (dd, J=16, 6 Hz 1H), 2.811 (dd, J=16, 5.5 Hz, 1H), 2.030 (m, 1H), 1.861–1.732
(m, 4H), 1.662–1.158 (m, 2H), 1.256 (s, 3H), 1.208 (d, J=6 Hz, 3H), 1.055 (s, 21H), 0.968 (d, J=7 Hz, 3H), 0.954 (d, J=7 Hz,
3H), 0.887 (s, 9H), 0.878 (s, 9H), 0.088 (s, 6H), 0.034, 0.030 (s, s, 6H); 13C NMR (125 MHz) δ 209.506, 130.756, 129.325,
113.743, 77.890, 74.984, 72.143, 69.837, 66.707, 64.516, 55.249, 47.961, 46.803, 44.737, 40.826, 34.204, 27.052, 26.167,
20.037, 18.244, 15.633, 12.999, 12.715, −1.610, −1.659, −5.429; anal. calcd for C45H88O8Si3: C, 64.23; H, 10.54. Found:
C, 64.27; H, 10.53.