Influence of counter-ions on the stereospecificity of chain propagation in the polymerization of alkyl derivatives of laevoglucosan

The stereospecificity of the cationic polymerization of alkyl derivatives of laevoglucosan has been investigated at room temperatures. In the presence of initiators with weak nucleophilic counter-ions polymerization takes place by an oxonium mechanism with the formation of stereospecific α-(1–6)-pol...

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Bibliographic Details
Published in:Polymer science USSR 1984, Vol.26 (10), p.2422-2431
Main Authors: Berman, Ye.L., Gorkovenko, A.A., Ponomarenko, V.A.
Format: Article
Language:English
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Summary:The stereospecificity of the cationic polymerization of alkyl derivatives of laevoglucosan has been investigated at room temperatures. In the presence of initiators with weak nucleophilic counter-ions polymerization takes place by an oxonium mechanism with the formation of stereospecific α-(1–6)-polysaccharides. Transition to initiators with more nucleophilic anions is accompanied by a diminution of stereospecificity and by the formation of β-glycoside bonds. A stereoregulation mechanism has been proposed.
ISSN:0032-3950
1878-268X
DOI:10.1016/0032-3950(84)90156-4