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28
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85030273158
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The role of this salt is not well understood
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9) The role of this salt is not well understood.
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29
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0028486123
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10) For the preparation of isosorbide-isomannide derivatives 5j-5l, see: Abenhaim, D.; Loupy; A.; Munnier, L.; Tamion, R.; Marsais, F.; Queguiner, G. Carbohydrate Res., 1994, 261, 255-266.
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85030273635
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11) For the use of isomannide-isosorbide derivatives in normal electron demand asymmetric Diels-Alder reactions, see the following paper, Loupy, A.; Monteux, D.
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Loupy, A.1
Monteux, D.2
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31
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85030278121
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note
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12) The exo selectivity of these cycloadditions was deduced from nOe experiments showing the spatial proximity between N-CH-O and R*O-CH. Moreover, a cycloaddition performed with (E) 7f afforded a mixture of diastereomeric endo-exo adducts. For further discussion, see ref. 3d. The diastereoselectivity of these cycloadditions was measured by integration of the signal attributed to N-CH-O which appeared as a doublet between 4.8 and 5 ppm.
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32
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85030278984
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note
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2. The coordinates of the hydrogen atoms were refined with an isotropic thermal factor equivalent to that of the bonded carbon atom, plus 10%. Atomic coordinates, bond lengths, bond and torsion angles, and thermal parameters at the Cambridge Crystallographic Data Centre, UK.
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