Abstract
An improved synthesis in described for the dibenzazonine precursor of erysodienone . Other biphenyl-4,4′-diols, bridged by two, three and five atoms, were also prepared. E.s.r. examination of the oxidation of these compounds produced spectra of the 9,10-dihydrophenanthrene-4,4′- semiquinone system, hitherto unrecorded, but semiquinone spectra could not be obtained from the other diols.
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9 articles.
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