Tailored synthesis of branched polymers with poly(tetrahydrofuran) having an azetidinium salt end group

Citation
H. Oike et al., Tailored synthesis of branched polymers with poly(tetrahydrofuran) having an azetidinium salt end group, MACRO CH P, 200(4), 1999, pp. 768-773
Citations number
21
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
MACROMOLECULAR CHEMISTRY AND PHYSICS
ISSN journal
10221352 → ACNP
Volume
200
Issue
4
Year of publication
1999
Pages
768 - 773
Database
ISI
SICI code
1022-1352(199904)200:4<768:TSOBPW>2.0.ZU;2-N
Abstract
Monofunctional poly(tetrahydrofuran), (poly(THF)), having a 1-(diphenylmeth yl)azetidinium end group (1) was prepared and subjected to an ion-coupling reaction with various mono- and plurifunctional carboxylates (2a-j). Multia rmed polymers having 2, 3, 4 and 6 arms were obtained in almost pure form b y repeating a simple precipitation of a THF solution of 1 into an ice-coole d aqueous solution containing an excess amount of the relevant plurifunctio nal carboxylates (2c-g) as sodium salts. Another model-branched polymacromo nomer was obtained in high yield through the macromolecular ion-coupling re action of 1 with poly(sodium acrylate) (2h) of DP = 22. Moreover, the ion-c oupling reaction of 1 with sodium (L)-tartarate (2i) or sodium 2,2'-dihydro xy-1,1'-binaphthyl-3,3'-dicarboxylate (2j) allowed one to introduce two hyd roxyl groups at the center of a linear poly(THF) segment.