Li+ (3 equiv.) is used as an assembling centre to generate a double-stranded helical complex from two linear coordinating fragments, each containing three 1,10-phenanthroline units and bearing terminal olefins at their ends; ruthenium-catalyzed ring-closing metathesis on the helical precursor leads to a 4-crossing [2]-catenane in 30% yield, making the procedure reasonably preparative.
C. Dietrich-Buchecker and J. Sauvage, Chem. Commun., 1999, 615 DOI: 10.1039/A809885I
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