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28
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0043040097
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note
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2, -78 to 0 °C, 93%.
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30
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33845278094
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Mahoney, W. S.; Brestensky, D. M.; Stryker, J. M. J. Am. Chem. Soc. 1988, 110, 291.
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Mahoney, W.S.1
Brestensky, D.M.2
Stryker, J.M.3
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0043040095
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note
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2O, -78 °C, 80%.
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33
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0042038458
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note
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2O (4:1), 93%.
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34
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0042538484
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note
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-1 indicated the existence of a nonconjugated ketone carbonyl.
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35
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0042037607
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note
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The ratio of isomers was determined by HPLC analysis (column, Zorbax Sil, 4.6 × 250 mm; eluent. 9% AcOEt in hexane; flow rate, 1.0 mL/min).
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36
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0042538487
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note
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Molecular mechanics calculations indicate that the (16S, 19S,23S)-isomer 19 is 2.0 kcal/mol higher in energy than 18.
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37
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0043040096
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note
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The other five stereoisomers were estimated to be 3.0-7.6 kcal/ mol higher in energy than 18.
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38
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0030605819
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In the case of 1,7,9-trioxadispiro[5.1.5.3]hexadecane, the cis-isomer, wherein both O1 and O9 are axially disposed about the central ring, is reported to be less stable by 0.3-0.7 kcal/mol than the trans-isomer without the destabilizing dipole repulsion: McGarvey, G. J.; Stepanian, M. W.; Bressette, A. R.; Ellena, J. F. Tetrahedron Lett. 1996, 37, 5465.
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McGarvey, G.J.1
Stepanian, M.W.2
Bressette, A.R.3
Ellena, J.F.4
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39
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0043039242
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note
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The ratios of 18, 19, 20, and another unidentified isomer after 4 and 48 h were 85:8:3:4 and 82:8:6:4, respectively.
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40
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0042539312
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note
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4c However, they did not mention the result of epimerization of the desired isomer.
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41
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0042037608
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note
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2O, -78 °C, 73%.
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