Concerning the above described role of the Friedel-Crafts catalyst in the crosslinking pathway, its relation to the structural and catalytic properties of the macroligand is studied. Beside the Lewis catalysts AlCl3 and FeCl3, trifluoromethanesulfonic acid (TFMSA) which is known for its catalyzing abilities in the HCP synthesis, was applied for the knitting of PPh3 with BCMBP as external crosslinker (Fig. ). The comparison of the polyphosphines Al-P-BP, Fe-P-BP and SA-P-BP in FTIR (Fig. ) suggests a different degree of substitution of the aromatic units. While