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World Scientific Publishing, Journal of Porphyrins and Phthalocyanines, 05n06(16), p. 556-563

DOI: 10.1142/s108842461250054x

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Corroles programmed for regioselective cycloaddition chemistry — synthesis of a bisadduct with C60-fullerene

Journal article published in 2012 by Chengjie Li ORCID, Martin Fechtel, Yaqing Feng, Bernhard Kräutler
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

A symmetrical β,β′-tetrasulfoleno-corrole is described here as an excellent and selective precursor to highly reactive corrole-β,β′-dienes, opening a selective route to specific β,β′-functionalized corroles via cycloaddition chemistry. The β,β′-tetrasulfoleno-corrole was prepared by acid catalyzed condensation of tolylaldehyde and a β,β′-disulfoleno-dipyrromethane, which was obtained by standard procedures. Crystalline deep green β,β′-tetrasulfoleno-corrole was isolated in 8–10% yield. Thermolysis of the corrole at 140 °C and in presence of an excess of C60 -fullerene gave a difullereno-corrole selectively (> 80% yield). The spectroscopic data indicated attachment of the two fullerene units at the "western," directly connected pyrrole rings. The tetrasulfoleno-corrole thus showed a remarkable preference for loss of sulphur dioxide and subsequent cycloaddition at the two "western" rings. In the difullereno-adduct, two sulfolene groups in the remaining "eastern" β,β″-disulfoleno-pyrroles still are available as "caged dienes" for further thermal diene formation, and attachment of additional groups via [4 + 2]-cycloaddition reactions.