1953 年 73 巻 2 号 p. 185-187
The alcoholic solution of formyldesoxybenzoin (F. D. B.) gives purplish brown precipitate with trivalent iron and seems to offer possible specific coloring reagent for Fe+++. The limit of determination is 1γ per drop (0.05cc.). This color reaction is not affected by the concurrent presence of 100 volumes of Ni++, Co++, and Cu++. Attempt to derive F. D. B. to its oxime with hydroxylamine resulted in the formation of 4, 5-diphenylisoxazole, instead of the oxime, which indicated the structure of F. D. B. in alcoholic solution. In other words, F. D. B. was proved to be in a stable β-type and that the colored precipitate with trivalent iron was formed by the intramolecular complex salt of this β-type.