Abstract
Reaction of 4-(lithiophenyl)dimesitylborane with xanthone followed by reaction of the resulting alcohol with HBF4 affords the cation 1-dimesitylboron-4-(9-xanthylium)-phenylene (1) + as a tetrafluoroborate salt. This salt has been fully characterized and its crystal structure determined. Cation (1) + can be reduced to produce a persistent radical that has been studied by EPR and whose reaction with dioxygen affords a peroxo derivative.
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