It has been shown that Z-selective reactions in ROMP have some generality and that syndiotacticity (for cis polymers) is predictable as a consequence of the mechanism through which MAP catalysts operate, i.e., inversion of configuration at the metal center with each forward metathesis step (stereogenic metal control).
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Z-Selective and Syndioselective Ring-Opening Metathesis Polymerization (ROMP) Initiated by Monoaryloxidepyrrolide (MAP) Catalysts
(Richard R. Schrock et al. Macromolecules, 2010, 43, 7515–7522)