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http://dx.doi.org/doi:10.1016/j.tetlet.2005.10.147An efficient synthesis of 4,4′,5,5′-tetraiododibenzo-24-crown-8 and its highly conjugated derivatives
Authors: Joshua J. Pak, Jaime L. Mayoa and Endrit Shurdhaa
Tetrahedron Letters Volume 47, Issue 2, Pages 233-237