Abstract
It was made clear that one of the photochemical reaction produts of ubiquinone (35) (I) had the structure (II) in which one of the two methoxyls of I was converted to a hydroxyl. And it was named demethylubiquinone (35). II was converted to demethylubichromenol (35) (IV) by treating with triethylamine, and the position of the hydroxyls of II was decided from the fact that the two hydroxyls of IV gave a color reaction with phosphomolybdic acid, showing that they are in ortho-relation.
