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. 2017 Aug 16;56(37):11166–11194. doi: 10.1002/anie.201702531

Scheme 18.

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.