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For a few recent examples see: (a) Cobben, P. L. H. M.; Egberink, R. J. M.; Borner, J. G.; Bergveld, P.; Verboom, W.; Reinhoudt, D. N. J. Am. Chem. Soc. 1992, 114, 10573. (b) Ungaro, R.; Casnati, A.; Ugozzoli, F.; Pochini, A.; Dozol, J.-F.; Hill, C.; Rouquette, H. Angew. Chem., Int. Ed. Engl. 1994, 33, 1505. (c) Arnaud-Neu, F.; Barrett, G.; Harris, S. J.; Owens, M.; McKervey, M. A.; Schwing-Weill, M.-J.; Schwinte, P. Inorg. Chem. 1993, 32, 2644.
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85033823925
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note
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All association constants given are in chloroform at 298 K unless stated otherwise.
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Pochini, A.5
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Ungaro, R.7
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31
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0029029733
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Recently Shinkai et al. reported the formation of hydrogen-bonded complexes/structures comprising calix[4]arenes substituted with diaminopyridine moieties at the lower rim and simple barbituric acid derivatives: Lhotak, P.; Shinkai, S. Tetrahedron Lett. 1995, 36, 4829.
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33845283282
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This interaction has been used in the design of receptors for amines by Rebek et al.: Rebek, J., Jr.; Askew, B.; Killoran, M.; Nemeth, D.; Lin, F.-T. J. Am. Chem. Soc. 1987, 109, 2426. The interaction is also used to stabilize liquid crystallinity in polymers or to introduce ferroelectricity. See, for instance: Wilson, L. M. Macromol. 1994, 27, 6683. Kumar, U.; Fréchet, J. M. J.; Kato, T.; Ujiie, S.; Timura, K. Angew. Chem., Int. Ed. Engl. 1992, 31, 1531. The same interaction was used by Shinkai et al. in the construction of the upper rim hydrogen-bonded calix[4]arene duplexes mentioned above. Further, interesting solid state structures were obtained by mixing isophthalic acids with pyrimidine or pyrazine: Valiyaveetil, S.; Enkelmann, V.; Müllen, K. J. Chem. Soc., Chem. Commun. 1994, 2097.
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33
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0001376403
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This interaction has been used in the design of receptors for amines by Rebek et al.: Rebek, J., Jr.; Askew, B.; Killoran, M.; Nemeth, D.; Lin, F.-T. J. Am. Chem. Soc. 1987, 109, 2426. The interaction is also used to stabilize liquid crystallinity in polymers or to introduce ferroelectricity. See, for instance: Wilson, L. M. Macromol. 1994, 27, 6683. Kumar, U.; Fréchet, J. M. J.; Kato, T.; Ujiie, S.; Timura, K. Angew. Chem., Int. Ed. Engl. 1992, 31, 1531. The same interaction was used by Shinkai et al. in the construction of the upper rim hydrogen-bonded calix[4]arene duplexes mentioned above. Further, interesting solid state structures were obtained by mixing isophthalic acids with pyrimidine or pyrazine: Valiyaveetil, S.; Enkelmann, V.; Müllen, K. J. Chem. Soc., Chem. Commun. 1994, 2097.
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Wilson, L.M.1
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34
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33748224741
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This interaction has been used in the design of receptors for amines by Rebek et al.: Rebek, J., Jr.; Askew, B.; Killoran, M.; Nemeth, D.; Lin, F.-T. J. Am. Chem. Soc. 1987, 109, 2426. The interaction is also used to stabilize liquid crystallinity in polymers or to introduce ferroelectricity. See, for instance: Wilson, L. M. Macromol. 1994, 27, 6683. Kumar, U.; Fréchet, J. M. J.; Kato, T.; Ujiie, S.; Timura, K. Angew. Chem., Int. Ed. Engl. 1992, 31, 1531. The same interaction was used by Shinkai et al. in the construction of the upper rim hydrogen-bonded calix[4]arene duplexes mentioned above. Further, interesting solid state structures were obtained by mixing isophthalic acids with pyrimidine or pyrazine: Valiyaveetil, S.; Enkelmann, V.; Müllen, K. J. Chem. Soc., Chem. Commun. 1994, 2097.
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Ujiie, S.4
Timura, K.5
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35
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37049069446
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This interaction has been used in the design of receptors for amines by Rebek et al.: Rebek, J., Jr.; Askew, B.; Killoran, M.; Nemeth, D.; Lin, F.-T. J. Am. Chem. Soc. 1987, 109, 2426. The interaction is also used to stabilize liquid crystallinity in polymers or to introduce ferroelectricity. See, for instance: Wilson, L. M. Macromol. 1994, 27, 6683. Kumar, U.; Fréchet, J. M. J.; Kato, T.; Ujiie, S.; Timura, K. Angew. Chem., Int. Ed. Engl. 1992, 31, 1531. The same interaction was used by Shinkai et al. in the construction of the upper rim hydrogen-bonded calix[4]arene duplexes mentioned above. Further, interesting solid state structures were obtained by mixing isophthalic acids with pyrimidine or pyrazine: Valiyaveetil, S.; Enkelmann, V.; Müllen, K. J. Chem. Soc., Chem. Commun. 1994, 2097.
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The route via the tetraformyl derivative has the advantage over the procedure described by Regen et al. of being clean and producing the tetracarboxylic acid in good yield after very simple purification, especially on a larger scale. Conner, M.; Janout, V.; Regen, S. L. J. Org. Chem. 1992, 57, 3744.
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Dicarboxylic acid 2 is quite soluble in chloroform and is assumed to be present as a strongly hydrogen-bonded dimer in apolar solvents like chloroform, since such behavior was established recently for a closely related compound: (a) Arduini, A.; Fabbi, M.; Mantovani, M.; Mirone, L.; Pochini, A.; Secchi, A.; Ungaro, R. J. Org. Chem. 1995, 60, 1454.
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a of 0.90 and a maximum value of 1.72. Since both of these values are < 2 it may be assumed that any interaction between these acids and bases will be of a hydrogen-bonded nature, with negligible proton transfer.
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85033809319
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note
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The possible self-association of the components has not been taken into account since in the case of tetracarboxylic acid 5 this could not be determined on account of its very low solubility in chloroform. The estimated error in the K values is about 10%.
-
-
-
-
54
-
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85033830531
-
-
note
-
Qualitatively, the stronger interaction is also indicated by the ease of which the initial suspensions of the 1:1 mixtures become clear solutions.
-
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55
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85022843857
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Conner, M.; Janout, V.; Regen, S. L. J. Am. Chem. Soc. 1991, 113, 9670.
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85033806531
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note
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2v symmetry.
-
-
-
-
57
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85033811558
-
-
note
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-1.
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