TY - JOUR A1 - Hewgill, FR A1 - Pass, MC T1 - On the Synthesis of 2,12-Dimethoxy-6,7,8,9-tetrahydro-5H-dibenz[d,f]azonine-3,11-diol and the Other Bridged Biphenyldiols and the E.S.R. of Their Oxidation Products in Relation to the Biosynthesis of Erythrina Alkaloids JF - Australian Journal of Chemistry JO - Aust. J. Chem. Y1 - 1985 VL - 38 IS - 4 SP - 537 EP - 554 KW - UR - https://doi.org/10.1071/CH9850537 N2 - 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. ER -