1997
DOI: 10.1039/a703854b
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Ring-closing depolymerisation of aromatic polyethers

Abstract: Equilibration of aromatic poly(ether sulfone)s and poly-(ether ketone)s under conditions of fluoride-catalysed ether exchange leads, at low polymer concentrations in dipolar aprotic solvents, to efficient ring-closing depolymerisation.

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Cited by 48 publications
(36 citation statements)
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“…NMR end group analysis, however, is not affected by ether exchange reactions, because it only gives the ratio of dendron to backbone repeat unit concentrations and contains no information on where the dendrons are located on the polymer chains. It has been known in the literature that transetherification of activated arylether linkages readily happens during polymerization 17–20. Such side reactions, if taking place on our dendrons, would lead to defect structures in the target dumbbell‐like architecture and broaden the PDI, because the polymer chains can grow from the internal ether linkages of the dendrons.…”
Section: Resultsmentioning
confidence: 99%
“…NMR end group analysis, however, is not affected by ether exchange reactions, because it only gives the ratio of dendron to backbone repeat unit concentrations and contains no information on where the dendrons are located on the polymer chains. It has been known in the literature that transetherification of activated arylether linkages readily happens during polymerization 17–20. Such side reactions, if taking place on our dendrons, would lead to defect structures in the target dumbbell‐like architecture and broaden the PDI, because the polymer chains can grow from the internal ether linkages of the dendrons.…”
Section: Resultsmentioning
confidence: 99%
“…B. makrocyclische Ester [48] und Diarylether, [49] und in der ROP eingesetzt. Colquhoun et al [57] [58] f¸r eine Umesterung sind Polyester attraktive Verbindungen f¸r diese Art dynamischer Chemie. B. Poly-(ethersulfon) 17, [51] Poly(etheretherketon) 18 [52] matische Substitution, die durch elektronenziehende Gruppen stark erleichtert wird (¸blicherweise SO 2 -oder CO-Substituenten in ortho-oder para-Stellung zum Ort des nucleophilen Angriffs).…”
Section: Dynamische Kovalente Chemieunclassified
“…Large cycles have also been obtained as mixtures from equilibrium condensations like olefin metathesis [18] or from ring-closing depolymerizations. [19] The repetitive approach, involving protecting groups, used in the present work prevents all undesired oligomerizations and, thus, also prevents the tedious subsequent separations except in the last step. In this step the final, bifunctional ring precursor necessarily has the option to either cyclize or linearly oligomerize.…”
Section: Resultsmentioning
confidence: 99%