Recovered iPP after hydrogenolysis was also analyzed by NMR spectroscopy at 120 o C in C2D2Cl4. The polymer diastereopurity degrades (<mmmm> = 71 %), and contains <mmmr> (8 %), <rmmr> (3 %), <mmrr> (7 %), and <mrrm> (11 %) errors that are not present in the virgin iPP used in this study. This spectrum also contains signals at 30.60 and 20.74 ppm, indicating chain straightening; ~15% of the residual iPP is straightened. The 13 C{ 1 H} NMR spectra of residual iPP also contain minor signals for olefins and carbonyl functionalities (~7 %). SZO is known to react with alkanes to form alcohols or ketones via oxygen atom transfer reactions. These side reactions are probably not related to cleavage of iPP chains because oxygenates are not observed in isolated oils, and signals indicating that these oxygenates are at chain ends (i.e. P-C(O)Me) are not present in this spectrum.