Abstract
A range of metathesis catalysts have been used to prepare polymers from the title monomers. The fraction of cis double bonds, σ c, in the polymers was determined by 13C NMR spectroscopy. The spectra of polymers containing mainly cis or trans double bonds in the main chain, as well as polymers derived from these by hydrogenation, were analysed in detail in terms of orientational and tacticity effects. With endo-dicyclopentadiene, the catalyst RuC 3·3H 2O produced a high- cis polymer. This anomalous result is believed to be due to a steric effect at the catalyst site caused by endo-dicyclopentadiene also acting as a permanent ligand because of its unique potential, among these monomers, to chelate in a bidentate fashion.
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