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Experiments at RT failed to afford the opening adducts
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Experiments at RT failed to afford the opening adducts
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22
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22944481400
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note
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In all cases, the regio- and the stereochemistry of the major adducts was confirmed from selected H-H coupling constants from azidoalcohols 3a and 4a. Moreover, in the case of 3a, symmetry considerations imposed by the meso nature of the azidoalcohol arising from trans-diaxial Cl opening of epoxide 1 were conclusive.
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23
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22944489459
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note
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4 led to precipitation.
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24
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22944443171
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note
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1H NMR pattern of the cyclohexane moiety, since dihedral angles should be significantly different for both limit conformations (A1 and E1). Thus, high J values would be indicative of any of the "all-equatorial" conformations, whereas small J values would be expected for the "all-axial" one.
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22944491675
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note
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4 solution. On the other side, the above experimental requirements would be consistent with the participation of three Li ions that could chelate the "all-equatorial" conformer. This possibility was taken into account and despite the corresponding transition states for the C1 and C2 attack have been found, we could not obtain the optimised geometries for the corresponding pre-reactive complexes. However, form an energetic standpoint, the transition state describing the C1 attack also lie below in energy than that corresponding to the C2 attack, in agreement with the experimental findings.
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22944437334
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note
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Experimental conditions require heating at 80°C to revert the preferred coordination of Li ion with acetonitrile. (see ref. [19]).
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41
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