Marvel’s precursor

As a consequence of the insoluble character of conjugated polymers in genertd, methods in which a well-characterized precursor polymer is transformed in a final step into the fully conjugated target material have attracted increasing research efforts. Three methods have been reported Marvel s precursor, the ICI route, and the related route proposed by Grubbs. 

Marvel s Precursor. Marvel s precursor concept for the synthesis of poly(p-phenylene) dates back to the late 1950s (Fig. 11). The route is characterized, however, by several problems such as low molecular weight, poor regiochemical control, lack of stereochemical control, and poor control of the final aromatization process. This strategy nevertheless contains all the important features also found in more modern approaches to precursor polymers for poly(p-phenylene) the use of a cyclohexadiene monomer, its chain-growth polymerization to furnish the precursor polymer, and the precursor s subsequent aromatization to poly(p-phenylene) [316, 317]. 

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