Poly benzyl capped

The sodium salt of malonate carbanions reacts quantitatively with the living ends of poly(vinyl ether) s to give a stable carbon-carbon bond. This reaction was used to functionalize the ends of Hving poly(isobutyl vinyl ether) or poly(benzyl vinyl ether) with a vinyl ether polymerizable end group supported by a malonate ion (end-capping agent, 7) [151]. 

More recently, Matyjaszewski [132] and others [133,134] reported general methods of the transformation of living ROMP into ATRP and anionic polymerization. In this approach, polynorbornene (PNB) and poly(dicyclopentadiene) (PGP) with terminal bromide were synthesized by end-capping of the corresponding hving chain ends with benzyl bromide (Scheme 11.32). 

Figure 2. Relative viscosity-concentration plots in toluene at 25 C for poly 06-methylstyrene (Mn 6,000) end -capped with ( ) Mg carboxylate, (A) Mg sulfonate and ( ) dimethyl benzyl ammonium chloride.

Donovan et al., 2003) (II) O-ethyl xanthate with difunctional R group (Taton et al., 2001) till) a dithioester with difunctional Z group (Dureault et al., 2004) (IV) a trithiocarbonate with two identical R (benzyl) groups (Mayaduime et al., 2000) (V) a macro-CTA poly(ethylene oxide) capped with dithiobenzoate group (Hong et al., 2004) (VI) S,S -bis(2-hydroxyethyl-2 -butyrate) trithiocarbonate (You et al., 2004). 

Using the dechlorination reaction between dichloro-capped poly(methyl phenylsilylene) (PMPS) and />-(chlorodimethylsilylene propylene) benzyl chloride (LMC-25), the macroinitiator, LMI-26 was obtained, and used in the ATRP of St to give a block copolymer, LMB-27 as shown in Scheme 3.22 [89]. 

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