Macrocycles 16. Macrocyclic Dibutyltin Dicarboxylates by Ring-Closing Polycondensation
- 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.
Autor*innen: | Ralph-Peter Krüger, H.R. Kricheldorf, S. Böhme |
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Dokumenttyp: | Zeitschriftenartikel |
Veröffentlichungsform: | Verlagsliteratur |
Sprache: | Englisch |
Titel des übergeordneten Werkes (Englisch): | Macromolecular chemistry and physics |
Jahr der Erstveröffentlichung: | 2002 |
Verlag: | Wiley-VCH Verl. |
Verlagsort: | Weinheim |
Jahrgang/Band: | 203 |
Ausgabe/Heft: | 2 |
Erste Seite: | 313 |
Letzte Seite: | 318 |
DOI: | 10.1002/1521-3935(20020101)203:2<313::AID-MACP313>3.0.CO;2-V |
ISSN: | 1022-1352 |
ISSN: | 1521-3935 |
Verfügbarkeit des Dokuments: | Weder Datei noch physisches Exemplar vorhanden ("No Access") |
Datum der Freischaltung: | 19.02.2016 |
Referierte Publikation: | Ja |
Datum der Eintragung als referierte Publikation: | 05.03.2003 |