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. Author manuscript; available in PMC: 2018 Oct 9.
Published in final edited form as: Biomacromolecules. 2018 Feb 27;19(3):1082–1089. doi: 10.1021/acs.biomac.8b00221

Table 1.

Polymerization of γ-4-Phenylbutyrate–ε-Caprolactone with Different Catalytic Systems

catalyst % conv to
polymer		 % conv to
transesterified product		 Mn
(g mol−1)		 PDI
Sn(Oct)2 32 68 6000 1.52
NdCl3·3TEP/TIBA 73 27 13000 1.51
Zn(Undec)2 yield of the polymer was extremely low; higher transesterification
DBU no polymer or trans esterified product formed