In order to achieve insights into the relation between the external crosslinker and the polymeric porosity, we made advantage of the versatility of the building blocks in the HCP synthesis and varied the crosslinking reagents. The first section covers the influence of the length of the linker unit, in the second section the Friedel-Crafts catalysts are varied and the third section deals with the effect of different degrees of crosslinking on the porous structure (Scheme 2).