One‐pot double click reactions for the preparation of H‐shaped ABCDE‐type quintopolymer

Abstract

Abstract We employed for the first time double click reactions: Cu(I) catalyzed azide‐alkyne 1,3‐dipolar cycloaddition and Diels–Alder (4 + 2) reactions for the preparation of H‐shaped polymer possessing pentablocks with different chemical nature (H‐shaped quintopolymer) using one‐pot technique. H‐shaped quintopolymer consists of poly(ethylene glycol) (PEG)‐poly(methylmethacrylate) (PMMA) and poly(ε‐caprolactone) (PCL)‐polystyrene (PS) blocks as side chains and poly ( tert ‐butylacrylate) (P t BA) as a main chain. For the preparation of H‐shaped quintopolymer, PEG‐ b ‐PMMA and PCL‐ b ‐PS copolymers with maleimide and alkyne functional groups at their centers, respectively, were synthesized and simply reacted in one‐pot with P t BA with α‐anthracene‐ω‐azide end functionalities in N , N ‐dimethylformamide (DMF) using CuBr/ N , N , N ′, N ″, N ″‐pentamethyldiethylenetriamine (PMDETA) as catalyst at 120 °C for 48 h. The precursors and the target H‐shaped quintopolymer were characterized comprehensively by 1 H NMR, UV, FTIR, GPC, and triple detection GPC. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 3409–3418, 2009