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There are also several reports of rotaxanes with oriented threads, rings and stereogenic elements present in the overall framework. The question of the inherent chirality of the objects and of their stereoselective synthesis was however not addressed: X.-Q. Li M.-X. Jia X.-Z. Wang X.-K. Jiang Z.-T. Li G.-J. Chen Y.-H. Yu Tetrahedron 2005 61 9600
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16944362561
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We have so far no explanation for the rather large difference in yields between the racemic and enantiopure series A noticeable exception can be seen in the following article:
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33645659104
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note
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A homologous change of chemical shift was observed by Stoddart and co-workers for the benzylic protons of anthracen-9-yl-N-benzylmethane ammonium salts upon threading of 3. See ref. 16
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75
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33645665543
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note
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The overall lack of stereoselective induction from the chiral stopper makes the distinction of the two diastereomeric species not necessary (see below).
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76
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33645699146
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note
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2)) gave final values R = 0.042, ωR = 0.037, and S = 1.03(1) for 457 variables and 3061 contributing reflections. See CCDC-284835 for full crystallographic data in CIF format.
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89
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0033573102
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98
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0037682258
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TRISPHAT anion confers to its salts a high lipophilicity; the ion pairs being then poorly retained on polar chromatographic phases:
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Heinrichs, G.1
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