ROMP thiol

A number of polymer-bound thiols have also been found to be highly effective for ruthenium complexation and removal from polymers formed by ROMP processes. One of the best is the triazine derivative 11 (Figure 13.4), although a simple polymer-bound thioalkyl group can be equally effective [28]. Levels as low as 10-ppm ruthenium can readily be reached, provided that a suitably large excess of the bound ligand is used. 

A second approach to cross-hnking ROMP-based polymeric micelles, involving thiol-ene, was demonstrated by Qiao and coworkers [91]. ONBE anhydride (ONBE-an) and ONBE-PEG were polymerized as separate blocks to provide a... 

Figure 6.23 Procedure used for the synthesis of amphiphilic, thiol-reactive biock copolymers. (I) ROMP of the hydrophobic block with Grubbs catalyst, (ii) polymerization of the second block, (iii) termination of the polymerization with an excess of ethyl vinyl ether, (Iv) coupling of hexaethylene...

Scheme 9.10 Thiol-Michael addition on exo-ONBEs and their use homo and copolymerization via ROMP [49].

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