Enhanced Spin-capturing Polymerization and Radical Coupling Mediated by Cyclic Nitrones.

A series of cyclic nitrones have been tested for their spin-trapping activity in the enhanced spin-capturing polymn. of styrene and in nitrone-mediated radical coupling reactions. rac-2-isopropyl-2,3-dimethyl-1-oxy-2,3-dihydro-imidazol-4-one was found to be the most efficient nitrone. The specific polystyrene macroradical addn. rate to this nitrone was detd. to be 8.0 × 103 L.mol-1.s-1, which is by a factor of 10 higher than for previously studied compds. Via enhanced spin-capturing polymn., polymers in the range of oligomers to 30000 g.mol-1 were obtained. A strong dependence of mol. wt. on monomer conversion was obsd., which can be explained by the high trapping rate. In nitrone-mediated radical coupling, almost ideal coupling of bromine-functional polymers was obtained and the successful introduction of the residual alkoxyamine functionality confirmed.

Références

Titre
Enhanced Spin-capturing Polymerization and Radical Coupling Mediated by Cyclic Nitrones.
Type de publication
Article de revue
Année de publication
2012
Revue
Aust. J. Chem.
Volume
65
Pagination
1110–1116
ISSN
0004-9425
Soumis le 12 avril 2018