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Significant localization of the unpaired electron on the phosphorus atom of phosphasemiquinone radical anion 1 .- was revealed by EPR spectroscopy. This species was generated by reduction of 1, the first stable p-phosphaquinone. Employment of the 3,5-di-tert-butyl-4-oxocyclohexa-2,5-dien-1-ylidene moiety was essential for the synthesis as well as the effective kinetic protection of 1.
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Sasaki et al. (1999) studied this question.
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