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See the Supporting Information for details of the synthesis, structures, characterization of compounds (R, and (S)1, 2, 1·2, and, and, )-3, and the procedure for the asymmetric cyclopropanation
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See the Supporting Information for details of the synthesis, structures, characterization of compounds (R)- and (S)1, 2, 1·2, and (+)- and (-)-3, and the procedure for the asymmetric cyclopropanation.
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23
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34547796901
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We cannot exclude the possibility that the conversion rate of 1a·2 from one twist sense to another may be reduced at low temperatures. If this is the case, the helix-sense excess values (Table 1) were overestimated
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We cannot exclude the possibility that the conversion rate of 1a·2 from one twist sense to another may be reduced at low temperatures. If this is the case, the helix-sense excess values (Table 1) were overestimated.
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We attempted to separate enantiomers of (+)- and (-)-3a by using chiral HPLC to determine their helix-sense excess (enantiomeric excess), but it was found to be difficult.
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We attempted to separate enantiomers of (+)- and (-)-3a by using chiral HPLC to determine their helix-sense excess (enantiomeric excess), but it was found to be difficult.
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