Chelated organic ligands amides

Catalytic inhibition, Cl, of polymerization was discovered almost simultaneously with CCT.13 In searching for the best CCT catalyst, the solubility of the catalyst is one of the important issues. Cobalt chelates with large planar ligands are poorly soluble in the desired monomers and common organic solvents such as acetone and dichloroethane. The solubility can be improved by incorporating more substituents into the equatorial ligands of the complexes, but this approach requires substantial synthetic effort. The easier approach is to use amides and DMSO as solvents because these solvents will dissolve most of the complexes both as their electroneutral forms and as salts. 

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