Abstract
AbstractA molecular link (a six crossing, doubly interlocked, [2]catenane with twisted rings) and a 31#31 granny knot (a composite knot made up of two trefoil tangles of the same handedness) were constructed by ring‐closing olefin metathesis of an iron(II)‐coordinated 2×2 interwoven grid. The connections were directed by pendant phenyl groups to be between proximal ligand ends on the same faces of the grid. The link was separated from the topoisomeric granny knot by recycling size‐exclusion chromatography. The identity of each topoisomer was determined by tandem mass spectrometry and the structure of the link confirmed by X‐ray crystallography, which revealed two 82‐membered macrocycles, each in figure‐of‐eight conformations, linked through both pairs of loops.
Highlights
A molecular 623 link and a 31#31 granny knot were constructed by ring-closing olefin metathesis of an iron(II)-coordinated 2 2 interwoven grid
The connections were directed by pendant phenyl groups to be between proximal ligand ends on the same faces of the grid
The identity of each topoisomer was determined by tandem mass spectrometry and the structure of the 623 link confirmed by X-ray crystallography, which revealed two 82-membered macrocycles, each in figure-of-eight conformations, linked through both pairs of loops
Summary
A molecular 623 link (a six crossing, doubly interlocked, [2]catenane with twisted rings) and a 31#31 granny knot (a composite knot made up of two trefoil tangles of the same handedness) were constructed by ring-closing olefin metathesis of an iron(II)-coordinated 2 2 interwoven grid. The relative orientation of the connections on the two faces of the grid plane dictates the topology formed: a 623 link (the joined ends on one face are roughly perpendicular to the joined ends on the other face) or a granny knot
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