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pubmed-article:19830287pubmed:dateCreated2009-10-15lld:pubmed
pubmed-article:19830287pubmed:abstractTextTwo cyclic oligoureas with 64- and 80-membered rings in which two sets of three or four rigid xanthene (X) units are connected via flexible diphenyl ether (D) units were synthesized by a stepwise fragment condensation. The compounds were characterized by (1)H NMR and ESI mass spectrometry. The structure of the cyclic octamer (XXXDXXXD) was additionally confirmed by single crystal X-ray analysis. The molecule assumes a strongly folded conformation with distorted C(2)-symmetry, stabilized by intramolecular hydrogen bonds. Surprisingly, intermolecular hydrogen bonds between the macrocycles were not observed. (1)H NMR spectra suggest a C(2) symmetrical conformation of the octamer in solution also, while its kinetically stable complex with three chloride ions has no symmetry element at all.lld:pubmed
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pubmed-article:19830287pubmed:year2009lld:pubmed
pubmed-article:19830287pubmed:articleTitleMacrocyclic oligoureas with xanthene and diphenyl ether units.lld:pubmed
pubmed-article:19830287pubmed:affiliationFachbereich Chemie, Pharmazie und Geowissenschaften, Abteilung Lehramt Chemie, Johannes Gutenberg-Universität Mainz, Duesbergweg 10-14, D-55099 Mainz, Germany.lld:pubmed
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pubmed-article:19830287pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed