http://pubs.acs.org/doi/pdf/10.1021/mz3001397
An alpha-beta unsaturated valerolactone was functionalized with conjugate addition of a thiol. Ring opening polymerization led to functionalized polyesters, but these substituted monomers underwent slower polymerization than the unfunctionalized. The group also showed copolymerization of functionalized valerolactone with caprolactone.
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