Furthermore, the polymer yield of P-dppm, P-dppe and P-dppp exceeds 100 %, revealing that the solvent 1,2-dichloroethane (DCE) is activated for the Friedel-Crafts alkylation and acts as an electrophilic substituent. Owing to its bifunctional structure, it can also contribute to the crosslinking of the aromatic units. Regarding the uptake of Ru, the major part of the [Ru(pcymene)Cl2]2 precursor coordinates to the fixed diphosphines P-dppm (0.82 wt%), P-dppe (0.76 wt%) and P-dppp (0.90 wt%) after the ligand exchange. P-Xantphos (0.31 wt%) and P-BINAP (0.47 wt%) take up lower amounts of Ru, indicating that a smaller fraction of the diphosphines are accessible or capable of sufficiently coordinating to the metal species.