Ring-opening metathesis polymerization of cyclic alkynes

3 Ring-opening metathesis polymerization of cyclic alkynes 

Another initiator for this polymerization is (Me3CO)3W=W(OCMe3)j, but analysis of the products by MS shows that they are macrocyclic oligomers. Their ring-size distribution, as determined by GPC, conforms to the Jacobson-Stockmayer relationship see Ch. 11. It is evident that with the tungsten catalyst 

The ROMP of tetrasilacycloocta-3,7-diynes can also be initiated by W=C or W=W complexes of the above type eqn. (18). 

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