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Cascade Synthesis of Chiral Block Copolymers Combining Lipase Catalyzed Ring Opening Polymerization and Atom Transfer Radical Polymerization

Tipo de material: TextoTextoSeries ; BioMacromolecules, 5, p.1862-1868, 2004Trabajos contenidos:
  • Peeters, J
  • Palmans, A.R.A
  • Veld, M
  • Scheijen, F
  • Heise, A
  • Meijer, E.W
Recursos en línea: Resumen: The enantioselective polymerization of methyl-substituted ¤-caprolactones using Novozym 435 as the catalyst was investigated. All substituted monomers could be polymerized except 6-methyl-¤-caprolactone (6-MeCL), which failed to propagate after ring opening. Interestingly, an odd-even effect in the enantiopreference of differently substituted monomers was observed. The combination of 4-methyl-¤-caprolactone with Novozym 435 showed good enantioselectivity also in bulk polymerization and resulted in enantiomerically enriched P((S)-4-MeCL)(eep up to 0.88). Subsequently, a novel initiator combining a primary alcohol to initiate the ring opening polymerization and a tertiary bromide to initiate atom transfer controlled radical polymerization (ATRP)was synthesized, and showed high initiator efficiencies (>90
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The enantioselective polymerization of methyl-substituted ¤-caprolactones using Novozym 435 as the catalyst was investigated. All substituted monomers could be polymerized except 6-methyl-¤-caprolactone (6-MeCL), which failed to propagate after ring opening. Interestingly, an odd-even effect in the enantiopreference of differently substituted monomers was observed. The combination of 4-methyl-¤-caprolactone with Novozym 435 showed good enantioselectivity also in bulk polymerization and resulted in enantiomerically enriched P((S)-4-MeCL)(eep up to 0.88). Subsequently, a novel initiator combining a primary alcohol to initiate the ring opening polymerization and a tertiary bromide to initiate atom transfer controlled radical polymerization (ATRP)was synthesized, and showed high initiator efficiencies (>90

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