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Metal-Free Activation in the Anionic Ring-Opening Polymerization of Cyclopropane Derivatives

✍ Scribed by Nicolas Illy; Sylvie Boileau; Jacques Penelle; Valessa Barbier

Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
248 KB
Volume
30
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

The successful activation observed when using Bu^t^P~4~ phosphazene base and thiophenol or bisthiols for the anionic ring opening polymerization (ROP) of di‐n‐propyl cyclopropane‐1,1‐dicarboxylate is described. Well‐defined monofunctional or difunctional polymers with a very narrow molecular weight distribution were obtained through a living process. Quantitative end‐capping of the propagating malonate carbanion was accessible by using either an electrophilic reagent such as allyl bromide or a strong acid such as HCl. Kinetics studies demonstrated a much higher reactivity compared to the conventional route using alkali metal thiophenolates.

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