Monomers containing a fused cyclopentene ring and more than one double bond

4 Monomers containing a fused cyclopentene ring and more than one double bond 

1 Norbornadiene and its derivatives without fused aromatic rings 

Where one or both of the 5,6-positions are substituted (135-143, 145-146), ROMP invariably occurs only by cleavage of the unsubstituted double bond. For monomers substituted at the 7-position only (133-134), less active catalysts favour cleavage of the less hindered C =C double bond, but more active catalysts show little discrimination between and 

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