Polymerization methods Suzuki coupling

FIGURE 47.12. Polymers containing oligo-p-phenylene sequences linked by ethylene (E), vinylene (V) or ethynylene (A). The numbers correspond to the degree of polymerization of the phenylene sequences. The monomers were connected through the Suzuki coupling method. 

Recently, Seyler et al. reported a continuous-flow methodology for Suzuki coupling polymerization. poly(9,9-dioctylfluorene) (PFO) using this method shows a quite high molecular weight of 62 000 within only 30 min. This reaction time is comparable to that of microwave-assisted polymerization. 

The first water-soluble, electroactive, self-doped sulfonatoalkoxy-substituted PPP, poly[2,5-bis(3-sulfonatopropoxy)-l,4-phenylene-aZf-l,4-phenylene] (55), was synthesized from 1,4-benzenediboronic acid [4612-26-4] (56) and the disodium salt of l,4-dibromo-2,5-bis(3-sulfonatopropoxy)benzene (57) by the homogeneous Suzuki coupling method (130). The polymer purified by dialysis of an aqueous solution was composed exclusively of 1,4-linkages. The abihty to utilize a variety of bis(boronic acids) in this polymerization with sulfonate containing aiyl hahdes will lead to a high degree of structural control of the optoelectronic properties of these water-soluble poljnners. 

---