Reductive dechlorination, PVCF

The bar graph in Figure 7 compares the triad stereosequence probabilities for the PVF samples examined here with values calculated for an equilibrium stereochemical distribution which would result from epimerization at 50 °C (18). All PVF samples, except for the urea polymer, rather fortuitously have nearly an equilibrium stereosequence distribution. Furthermore, both the precursor PVCF and final PVF derived therefrom have nearly identical p(m) values and stereosequence distributions, so that the effect of racemization during reductive dechlorination (19) is not apparent. 

Detailed expansion of the 188 MHz fluorine-19 resonances from isoregic PVF samples prepared by reductive dechlorination of (a) PCFE and (b) PVCF. The minor peaks marked with arrows in spectrum (a) are most likely due to end groups. 

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