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Racemic lactide was polymerized with various initiators containing Zn and Al, and the structures of the obtained polymers were determined by means of 13 C NMR spectroscopy. The extent of transesterification reactions was calculated on the basis of the analysis of the methine carbon signal in the polymer 13 C NMR spectra. Three groups of initiators can be distinguished in view of their influence on transesterification: ZnCl 2 exhibits the strongest transesterification activity, ZnEt 2 and ZnEt 2 /Al(OiPr) 3 are among those of medium activity, and Al(acac) 3 does not show transesterification activity at all.
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Bero et al. (1990) studied this question.
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