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0345142583
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1);
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18
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37049081617
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and references therein
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Attractive van der Waals interaction between the side chains may be responsible, at least in part, for the higher stability of the syntrialkylated truxenes. For a discussion of this effect on the conformational equilibrium of 1,3,5-trialkylbenzenes: J. E. Anderson, V. Bru-Capdeville, P. A. Kirsch, J. S. Lomas, J. Chem. Soc. Chem. Commun. 1994, 1077, and references therein.
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0344712112
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note
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syn-Truxenes 3f, 3j, and 3k were obtained directly from 1 (nBuLi deprotonation) (30, 33, and 43% yields, respectively). Alkylation of 1 with p-bromobenzyl bromide gave predominantly 2d (68%) which was isomerized with base to 3d (61% overall yield). For 2e, best results were obtained by using KH as the base.
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0346184325
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22
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0344712111
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note
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2) = 1.120. Crystallographic data (excluding structure factors) for the structures reported in this paper have been deposited with the Cambridge Crystallographic Data Center as supplementary publication nos. CCDC-101806 and CCDC-101807. Copies of the data can be obtained free of charge on application to CCDC, 12 Union Road, Cambridge CB2 1EZ, UK (fax: (+44) 1223-336-033; e-mail: deposit@ccdc.cam.ac.uk).
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For the self-association of porphyrins: R. J. Abraham, S. C. M. Fell, H. Pearson, K. M. Smith, Tetrahedron 1979, 35, 1759.
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0345574100
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[13b] of 1,3,5-tris(2-methylphenyl)benzene;
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33748472023
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3) (m/z 1049). For the silver ion extraction with cyclophanes: J. Gross, G. Harder, F. Vögtle, H. Stephan, K. Gloe, K. Angew. Chem. 1995, 107, 533; Angew. Chem. Int. Ed. Engl. 1995, 34, 481.
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33
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33748472023
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3) (m/z 1049). For the silver ion extraction with cyclophanes: J. Gross, G. Harder, F. Vögtle, H. Stephan, K. Gloe, K. Angew. Chem. 1995, 107, 533; Angew. Chem. Int. Ed. Engl. 1995, 34, 481.
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36
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0001247770
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Liquid crystals based on truxenes: D. Sandström, M. Nygren, H. Zimmermann and A. Maliniak, J. Phys. Chem. 1995, 99, 6661, and references therein.
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