Inside Cover: Tetrameric Cyclic Double Helicates as a Scaffold for a Molecular Solomon Link (Angew. Chem. Int. Ed. 25/2013)



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Doubly-entwined interlocked rings also known as Solomon's knots, are a common motif in Celtic art and stonework, such as the examples from St Magnus Cathedral, Orkney, shown in the picture. In their Communication on page 6464 ff., D. A. Leigh and co-workers report on the use of a tetrameric circular helicate to synthesize a molecular Solomon's knot. The one-pot synthesis assembles four iron(II) cations and four bis(aldehyde) and four bis(amine) building blocks to generate the two interwoven 68-membered-ring macrocycles in 75 % yield.