NMR silent, naturally-occurring quinones
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Steven J. Gould; Chris R. Melville
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Article
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1997
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Elsevier Science
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French
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Kinobscurinone, a benzo[b] fluorenone quinone previously reported to be "NMR silent," affarding neither 1H-nor 13C NMR spectra under a variety of conditions, has now been shown to exist in part as a free radical under ambient conditions. The g value for kinobscurinone was found to be 2.0052; no hyp