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(A) Acid‐base switching of a rotaxane catalyst by alternating the preferential binding site of the macrocycle. Adapted with permission.[ 84 ] Copyright 2012, Wiley‐VCH. (B) Switchable catalysis of Michael addition and Diels–Alder reactions by in situ generations of a trityl cation via bromide abstraction using Zn(II)–pentafoil knot [Zn52](BF4)10. Adapted with permission.[ 86 ] Copyright 2016, The Nature Publishing Group
