Über einige Oxydationsprodukte der Tokopherole und analoger einfacher Modellkörper. 6. Mitteilung über Antisterilitätsfaktoren (Vitamin E)

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Abstract
The u.-v. absorption spectra of similarly substituted oxy-chromanes and oxy-cumaranes show only slight differences which are insufficient for differentiation. The shift of the maxima of the u.-v. absorption curves of the esters is large enough for differentiation. The oxidation and reduction expts. with tocopherols show an easily reversible relation only between the quinone- and hydroquinone-stage. A vitamin-E effect was noted only with a-tocopherol-quinone.