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a) Schill's approach towards a molecular trefoil knot using a covalent scaffold. Trimerization of a crowded quinone 31 was projected to give a molecular trefoil knot after cyclization and hydrolysis.92 b) Walba's Möbius strip approach towards molecular knots. Introducing a half twist in compound 32 before connecting the ends yields molecular Möbius strip 33. Statistical twisting was too disfavored to yield trefoil knot 34 after ozonolysis.93
