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4344559885
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note
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There is also an influence of the ether residues, which is not yet entirely explored.
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12
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(a) Arduini, A.; McGregor, W. M.; Paganuzzi, D.; Pochini, A.; Secchi, A.; Ugozzoli, F.; Ungaro, R. J. Chem. Soc., Perkin Trans. 2 1996, 839-846.
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5844380513
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Arduini, A.; Böhmer, V.; Delmau, L.; Desreux, J.-F.; Dozol, J.-F.; Garcia Carrera, M. A.; Lambert, B.; Musigmann, C.; Pochini, A.; Shivanyuk, A. Chem. Eur. J. 2000, 6, 2135-2144.
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19
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4344562488
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note
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Compound 1 is prepared according to the procedure in ref 10. We found that prewashing the NaH was crucial for successful alkylation.
-
-
-
-
20
-
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4344706758
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note
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Obviously the rigidified calix[4]arene skeleton causes steric problems, since a tert-butyl-trityl-substituted tetra urea could not be obtained reproducibly.
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21
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Jacobi, R. A.; Böhmer, V.; Grüttner, C.; Kraft, D.; Vogt, W. New J. Chem. 1996, 20, 493-501.
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4344609785
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note
-
More detailed studies of the heterodimerization between 2a and 3a and the corresponding tetratosyl-ureas are presented in a forthcoming article.
-
-
-
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26
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0037694829
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6 (up to 70%), see: Felix, O.; Crego-Calama, M.; Luyten, I.; Timmerman, P.; Reinhoudt, D. N. Eur. J. Org. Chem. 2003, 1463-1474.
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27
-
-
4344562489
-
-
note
-
-1) is comparable to the rate of the dissociation/ recombination; see ref 2c.
-
-
-
-
28
-
-
4344657412
-
-
note
-
6 (even after 15 h at 60 °C) may be explained in a similar way by kinetic problems.
-
-
-
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29
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0029989549
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Arduini, A.; Mirone, L.; Paganuzzi, D.; Pinalli, A.; Pochini, A.; Secchi, A.; Ungaro, R. Tetrahedron 1996, 52, 6011-6018.
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