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Dodecabromo- and Dodecaiodocentrohexaindane: T d -Symmetrical Key Building Blocks for Twelve-Fold Cross-Coupling Reactions and Six-Fold Orthogonal Extension.
Chemistry : a European Journal 2018 July 3
Centrohexaindane was converted into its Td -symmetrical 2,3,6,7,10,11,14,15,20,21,26,27-dodecabromo and -dodecaiodo derivatives using N-bromo- and N-iodosuccinimide, respectively, in the presence of trifluoromethanesulfonic acid as a catalyst in single, highly efficient steps. Sonication or microwave irradiation was indispensable to enforce exhaustive halogenation of the twelve equivalent peripheral positions of this Cartesian polyaromatic hydrocarbon. Despite their extremely poor solubility in most organic solvents, the new dodecahalo derivatives were fully characterized, including single crystal X-ray structure analysis. Subsequent Pd0 -catalyzed twelve-fold C-C cross-coupling reactions furnished the corresponding dodecamethyl, dodeca(phenylethynyl) and dodecaphenyl derivatives in good to excellent yields. The latter hydrocarbon was also analyzed by X-ray diffraction.
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