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23
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0043232094
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-
note
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By application of the simple rule of arbitrary deformation for finding out whether two compounds are topological isomers (for a definition of topological isomerism see refs.[22,23]), the tether (i.e., the carbonate linkage) between the two rings of 7 and 8 can collapse to a point common to both rings. This converts 7 into 8 and vice versa. Therefore, within the strict definition of topology, 7 and 8 are topologically identical. However, the real molecules 7 and 8 cannot be converted into each other without bond breaking and this is strictly forbidden in topology. Because of this dilemma the term "residual topology" was recently suggested in ref.[21]
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26
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0002797322
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J.-C. Chambron, C. Dietrich-Buchecker, J.-P. Sauvage, Top. Curr. Chem. 1993, 165, 131.
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Chambron, J.-C.1
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Sauvage, J.-P.3
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27
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0037112722
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A. Godt, S. Duda, Ö. Ünsal, J. Thiel, A. Härter, M. Roos, C. Tschierske, S. Diele, Chem. Eur. J. 2002, 8, 5094.
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Godt, A.1
Duda, S.2
Ünsal, Ö.3
Thiel, J.4
Härter, A.5
Roos, M.6
Tschierske, C.7
Diele, S.8
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28
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0043232092
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note
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3N.
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-
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29
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0043232089
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R. E. Stenseth, R. M. Schisla, J. W. Baker, J. Chem. Eng. Data 1964, 9, 390.
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J. Chem. Eng. Data
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Stenseth, R.E.1
Schisla, R.M.2
Baker, J.W.3
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30
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0042229854
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-
note
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α of 8c, 1c, and 2c, respectively). The data for the corresponding compounds with smaller rings are nearly the same.
-
-
-
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31
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0042730781
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note
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1H NMR signals and FD-MS signals were found for products from experiments with ring precursor 5a(H) and a model compound for 5(H) bearing two methoxy groups instead of the long alkoxy substituents.
-
-
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33
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0042730785
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-
note
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1H NMR signals are two broadened singlets at δ = 8.08 and 8.07 ppm and a triplet at δ = 2.93 ppm. This compound was eluted from silica gel only upon increasing the polarity of the solvent.
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-
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34
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0043232091
-
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note
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2 and finally distilled.
-
-
-
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35
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0043232090
-
-
note
-
The SEC traces of the mixtures of precatenanes 7 and dumb-bells 8 as obtained after column chromatography can be found in ref.[35]
-
-
-
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36
-
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0042730784
-
-
note
-
1H NMR spectroscopic data of 9b and 1b and of 10c and 11c, respectively.
-
-
-
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37
-
-
0042730783
-
-
note
-
[35]) as an alternative structure for the isolated compounds was excluded for 9a, 9c, and 10c by a combination of SECs, mass spectrometry, and NMR spectroscopy, as described for 9b in ref.[18]
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38
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0038631786
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M. R. Shah, S. Duda, B. Müller, A. Godt, A. Malik, J. Am. Chem. Soc. 2003, 125, 5408.
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J. Am. Chem. Soc.
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Shah, M.R.1
Duda, S.2
Müller, B.3
Godt, A.4
Malik, A.5
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39
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0034596919
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A. Godt, Ö. Ünsal, V. Enkelmann, Chem. Eur. J. 2000, 6, 3522.
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(2000)
Chem. Eur. J.
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Godt, A.1
Ünsal, Ö.2
Enkelmann, V.3
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40
-
-
0042730786
-
-
note
-
A related result was reported by Isele et al. (refs. [4,381). In this case the size of the threaded ring was kept constant and the length of the threading ring precursor was varied.
-
-
-
-
42
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-
0042229850
-
-
note
-
The formation of some catenane due to entanglement of the long chains is possible, but only with a very low probability.
-
-
-
-
43
-
-
0041729488
-
-
note
-
The activation energy for the oxidative alkyne dimerization is assumed to be the same for the conformers A, B, and C.
-
-
-
-
44
-
-
0042730782
-
-
note
-
α signals of 7 and 8 is small (Δδ = 0.01 or 0.02) the integration is not very precise. Nevertheless, the figures are sufficiently accurate clearly to show the trend that, the larger the rings, the more dumbbell is formed.
-
-
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-
45
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0035901683
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D. A. Leigh, P. J. Lusby, S. J. Teat, A. J. Wilson, J. K. Y. Wong, Angew. Chem. Int. Ed. 2001, 40, 1538.
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Angew. Chem. Int. Ed.
, vol.40
, pp. 1538
-
-
Leigh, D.A.1
Lusby, P.J.2
Teat, S.J.3
Wilson, A.J.4
Wong, J.K.Y.5
-
46
-
-
0041729489
-
-
note
-
in other strategies (see refs.[10-17]), the species with geometrically arranged catenane subunits are formed in situ and reversibly. The formation of non-entwined rings as side products of catenane formation is therefore not necessarily due to conformational changes as discussed here.
-
-
-
-
48
-
-
0041729490
-
-
note
-
2 is its tendency to form emulsions with water. However emulsions can be avoided through addition of diethyl ether. This makes the extractive workup straightforward. To avoid hydrolysis of 2 when THF is used, either the THF must be removed or the reaction mixture must be diluted with a large amount of diethyl ether before water is added.
-
-
-
-
49
-
-
0042229852
-
-
note
-
The carbonate cleavage is very slow at room temperature, so cleavage at 50 °C, as described for the preparation of 9b, and 9c, is recommended.
-
-
-
-
50
-
-
0042229851
-
-
note
-
1H NMR spectra of the crude products are shown in the Supporting Information.
-
-
-
-
51
-
-
0042730780
-
-
note
-
As described in ref.[18] 9b and 1b can be separated by chromatography.
-
-
-
-
52
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-
0042229848
-
-
note
-
3 (see NMR spectra of 2c, 10c, and 11c in the Supporting Information). We assume a structural defect associated with the dimethylphenol moiety.
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