Scheme 18.

Synthesis of an 819 knot based on the circular triple helicate approach. Tetramer Fe4 47 4 is formed by the reaction of ligand 47 with FeCl2. Covalent capture by RCM yields knot Fe4 48.110.

Synthesis of an 819 knot based on the circular triple helicate approach. Tetramer Fe4 47 4 is formed by the reaction of ligand 47 with FeCl2. Covalent capture by RCM yields knot Fe4 48.110.