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II (2 g.) was dissolved in acetic acid (50 cc.) and, after addition of potassium dichromate (2 g.) in acetic acid (30 cc.), heated to boiling for two minutes. Upon pouring onto ice, a yellow precipitate (1.7 g.) was obtained. It crystallized from ethanol in yellow prisms of m. p. 135-136°. An additional recrystallization from acetic acid raised the m. p. to 140-141 °, as reported in the literature.6 The yield of pure produpt was 1.2 g. (60%).