Macrocycles, 16a - Macrocyclic Dibutyltin Dicarboxylates via Thermodynamically Controlled Polycondensations
- Various dibutyltin derivatives were polycondensed with aliphatic ,-dicarboxylic acids having chain lengths from 4 (succinic acid) to 22 carbon atoms. White crystalline products were obtained from all experiments, and the structure of the products was independent of the synthetic method. Viscosity measurements revealed low molecular weights (n 1 500 Da) in all cases. Vapor pressure osmometry (VPO) measurements and matrix-assisted laser desorption time-of-flight (MALDI-TOF) mass spectrometry proved that cyclic dimers and trimer were formed from dicarboxylic acids having 6 to 16 carbons, but mainly the monomeric cycle from docosane dioic acid. Heating to 250°C did not change the structure. Therefore, the results indicate that the macrocycles are the result of a thermodynamically controlled ring-closing polycondensation. This means that linear high-molecular weight poly(dibutyltin dicarboxylate)s cannot exist above room temperature.
MetadatenAutor*innen: | H.R. Kricheldorf, S. Böhme, Ralph-Peter Krüger |
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Dokumenttyp: | Zeitschriftenartikel |
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Veröffentlichungsform: | Verlagsliteratur |
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Sprache: | Englisch |
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Titel des übergeordneten Werkes (Englisch): | Macromolecular chemistry and physics |
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Jahr der Erstveröffentlichung: | 2002 |
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Verlag: | Wiley-VCH Verl. |
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Verlagsort: | Weinheim |
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Jahrgang/Band: | 203 |
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Ausgabe/Heft: | 2 |
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Erste Seite: | 313 |
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Letzte Seite: | 318 |
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Freie Schlagwörter: | MALDI; Macrocyclics; Oligomers; Polycondensation; Thermodynamics |
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ISSN: | 1022-1352 |
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ISSN: | 1521-3935 |
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Verfügbarkeit des Dokuments: | Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access") |
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Bibliotheksstandort: | Sonderstandort: Publica-Schrank |
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Datum der Freischaltung: | 19.02.2016 |
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Referierte Publikation: | Ja |
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Datum der Eintragung als referierte Publikation: | 16.01.2003 |
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