Self-assembled pseudocyclic structures consisting of two molecules of a crown-containing butadienyl dye and two Mg2+ ions readily undergo regio- and stereospecific [2+2] photocycloaddition in MeCN to produce a single cyclobutane stereoisomer in almost quantitative yield.
![Graphical abstract: Regio- and stereospecific [2+2] photocyclodimerization of a crown-containing butadienyl dyevia cation-induced self-assembly in solution](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=C0PP00227E&imageInfo.ImageIdentifier.Year=2011)
E. N. Ushakov, A. I. Vedernikov, M. V. Alfimov and S. P. Gromov, Photochem. Photobiol. Sci., 2011, 10, 15 DOI: 10.1039/C0PP00227E
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