A new spin on an old system: The title neutral radicals have been synthesized and characterized for the first time. Thanks to two terminal methoxy groups and three tert-butyl groups, the chiral radicals are configurationally and chemically stable. The three-dimensional π-electron network shows extensive spin delocalization, and the distinct CD properties are attributed to the chirality of the helicene unit (see picture).
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Ueda et al. (2012) studied this question.
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