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1985 (1)
1Author    HartmutB. Stegmann, Hoang Dao-Ba, Klaus Scheffler, MartinG. PeterRequires cookie*
 Title    ESR and ENDOR Investigations of Adrenochrome Semiquinone and Related Amino-1,2-Benzosemiquinone Radicals  
 Abstract    Dimethyl or diethylamine reacts very smoothly in ethanol solution with catechols to the corre­ sponding aminoquinones. The paramagnetic intermediates, the semiquinones, are investigated by ESR and E N D O R spectroscopy using the spin stabilisation technique with diarylthallium cations. The spectra of these radicals show clearly the thallium and nitrogen coupling and the hydrogen hyperfine structure. For some examples the signs of the proton coupling constants are determined by T RIPLE resonance experiments. The results indicate a negative spin density in one position of the unsymmetrically substituted radical 3. With the results obtained for the monocyclic aminosemiquinones the hyperfine structure of the adrenochrome semiquinone is analysed. 
  Reference    Z. Naturforsch. 40c, 531 (1985); received January 31/March 27 1985 
  Published    1985 
  Keywords    ESR-, ENDOR-Spectroscopy, Semiquinones, Adrenochrome 
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 TEI-XML for    default:Reihe_C/40/ZNC-1985-40c-0531.pdf 
 Identifier    ZNC-1985-40c-0531 
 Volume    40