Scheme 1. Proposed reversible H/D exchange mechanism for reactions of SZO300 and DHA-d4. Repetition of this cycle generates DHA-d0 and DHA-d4-x. SZO300 reacts with iPP or HDPE jn the presence of H2 to form extractable oils, Figure . Over the course of 5 h under 5 atm H2 SZO300 reacts with iPP at 200 o C in a neat polymer melt to form an atactic extractable oil soluble in CH2Cl2 (Mn = 970 g mol -1 , Đ = 3.1) in 51 % yield, Figure . Small amounts of C1 -C12 products also form in this reaction. Increasing reaction times beyond 5 h or increasing H2 pressure do not considerably increase product yields (Table ). The Mn values of the oils do not decrease at prolonged reaction times. However, treating the oils with fresh SZO300 does result in reduction of Mn values. In the absence of H2 also forms extractable oil (Mn = 1100 g mol -1 , Đ = 2.9), though in reduced yields.