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27844546400
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note
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4), concentrated and purified by flash chromatography.
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23
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0141712450
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Sharpless, K. B.; Amberg, W.; Bennani, Y. L.; Crispino, G. A.; Härtung, J.; Jeong, K. S.; Kwong, H. L.; Morikawa, K.; Wang, Z. M.; Xu, D. Q.; Zhang, X. L. J. Org. Chem. 1992, 57, 2768.
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24
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27844480317
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note
-
2O]: 298.2144; found: 298.2151.
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25
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0348183819
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44
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27844482744
-
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note
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R(min): 5.06 (24a, syn isomer), 3.58 (24a, anti isomer); 27.00 (24b, syn isomer), 19.66 (24b, anti isomer).
-
-
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46
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27844548241
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note
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2 (10 mmol, 0.68 mL). Standard work-up and purification of the resulting crude product by chromatography on silica gel gave the corresponding homo-allylic alcohol 24a in 96% yield.
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-
-
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47
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27844517636
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note
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3).
-
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49
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2542433188
-
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Carlsen, P. H. J.; Katsuki, T.; Martin, V. S.; Sharpless, K. B. J. Org. Chem. 1981, 46, 3936.
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-
50
-
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27844588222
-
-
note
-
3): δ = 171.62, 82.61, 71.90, 51.62, 44.86, 42.17, 25.94, 6.86, 6.36.
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51
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0029881497
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Zanardi, F.; Battistini, L.; Nespi, M.; Rassu, G.; Spanu, P.; Cornia, M.; Casiraghi, G. Tetrahedron: Asymmetry 1996, 7, 1167.
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52
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27844559434
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note
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2O).
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|