Vielgliedrige Donor‐substituierte Kohlenwasserstoffringe

Many‐Membered and Donor‐Substituted Hydrocarbon Rings The preparation of large rings 2 of the [2 n ]metacyclophane type by the Müller‐Röscheisen method is described. Yields of cyclic products, potential ligand or host character and ring size can be controlled by intra‐ and extraannular OCH 3 groups. The 40‐membered macrocyclus 24 containing eight substituted benzene rings is the largest ring compound of this series isolated so far in pure form. Large substituents OR in position 2 of the starting bis(bromomethyl) compounds lead to higher ring member numbers. The new macrocyclic compounds, with the exception of the “dimer” 7 , are all conformationally flexible according to 1 H‐NMR spectra. X‐ray structural analyses were performed of the macrocycles 10, 13, 17 , and 18 ; the inclusion of solvent molecules is proven.