The cyclooctenes and their derivatives

The trans monomer 33 gives a 43% cis polymer very rapidly in the presence of MoCl2(PPh3)2(NO)2/EtAlCl2 (Larroche 1983) and is polymerizable by Ru(=CHCH=CPh2)(Cl)2(PPh3)2 (Nguyen 1993). 

The conversion-time curves for the ROMP of the 5-alkylthiocyclooctenes (46) with R = Et, Bu, Hex, c-Hex, t-Bu) initiated by 52 are shown in Fig. 12.5. For R = Bu the rate of polymerization is proportional to both monomer and initiator concentrations. The most reactive monomers are those with branched alkyl substituents on the sulfur atom. Thus for R = f-Bu, reaction is 95% complete in about 10 min the ROMP of cyclooctene itself is at least five times faster imder 

The ROMP of 50 and 51, catalyzed by WCl4(OC6H3-Ph2-2,6)2/Et4Pb (1/2) at 15°C, gives high yields of polymers having intermediate cis content (Cho, I. 1993a,b). 

Olefin Metathesis and Metathesis Polymerization Na0H/H202 

---