Polymers 1 of the title monomer, prepared using well-defined molybdenum carbene complexes as catalysts, have been hydrogenated and the structures of the resultant polymers 2 examined by I3C NMR spectroscopy. The hydrogenated polymer made from the all-cis isotactic polymer of (+)-monomer showed a single set of I3C NMR lines as expected for an NX sequence of endo (N) and ex0 (X) substituents. The hydrogenated polymer made from a cis isotactic polymer of (+)-monomer showed additional fine structure arising from the random incorporation of both enantiomers in the isotactic polymer chain: four equal lines for C-9 (orientational triad sensitivity), two equal lines for C-3, C-4, C-5, and C-1 (dyad sensitivity), but single lines for C-8, C-2, C-7 and C-6 (insensitive to the relative orientation of adjacent repeating units). The hydrogenated polymer made from a trans atactic polymer of (+)-monomer showed fine structure due to the presence of both m and r dyads. That made from a trans atactic polymer of (+)-monomer contains 16 possible triad sequences and gave a more complicated spectrum. A complete assignment was made for the first three polymers and a partial assignment for the fourth. Polymers made using non-carbene catalysts were also examined. Hydrogenation of an all-trans precursor made from (+)-monomer using RuC13 as catalyst gave an atactic polymer, confirming previous observations. Hydrogenation of a 6 1 % cis, cis/trans blocky precursor, made from (+)-monomer using OsC13PhC X H as catalyst, gave a syndiotactic-biased stereoblocky polymer, indicating a c/r, t/m correlation in the precursor polymer.