Reduction of Cu(II) by photochemically generated phosphonyl radicals to generate Cu(I) as catalyst for atom transfer radical polymerization and azide-alkyne cycloaddition click reactions

Reduction of Cu(II) by photochemically generated phosphonyl radicals to generate Cu(I) as catalyst for atom transfer radical polymerization and azide-alkyne cycloaddition click reactions, Y. Yagci, M. A. Tasdelen, S. Jockusch, Polymer, 55, 3468–3474, (2014) DOI: 10.1016/j.polymer.2014.06.068

Abstract

The photoinduced electron transfer reactions of acylphosphine oxide type photoinitiators with Cu(II)Cl2/ N,N,N0 ,N00,N00-pentamethyldiethylenetriamine complex for both atom transfer radical polymerization and copper catalyzed azide-alkyne cycloaddition processes is investigated by laser flash photolysis. The photolytically generated phosphonyl radicals are effective in reducing Cu(II) salts to Cu(I) with rate constants of ~2 109 M1 s 1 . ©


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