Cyclic Polyhydroxy Ketones. I. Oxidation Products of Hexahydroxybenzene (Benzenehexol) - PubMed (original) (raw)

Cyclic Polyhydroxy Ketones. I. Oxidation Products of Hexahydroxybenzene (Benzenehexol)

Alexander J Fatiadi et al. J Res Natl Bur Stand A Phys Chem. 1963 Mar-Apr.

Abstract

Reliable procedures are given for the preparation and purification of hexahydroxybenzene (benzenehexol), tetrahydroxy-_p_-benzoquinone, rhodizonic acid, triquinoyl (cyclohexanehexone), croconic acid, and leuconic acid (cyclopentanepentone). Certain derivatives and color tests, as well as infrared and ultraviolet spectra, are reported for their identification.

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Figures

Figure 1.

Figure 1.. Infrared spectrograms of materials in Nujol mulls.

I, Hexahydroxybenzene; II, tetrahydroxyquinone; III, rhodizonic acid dihydrate. IV, Triquinoyl octahydrate; V, croconic acid trihydratc; VI, leuconic acid pentahydrate.

Figure 1.

Figure 1.. Infrared spectrograms of materials in Nujol mulls.

I, Hexahydroxybenzene; II, tetrahydroxyquinone; III, rhodizonic acid dihydrate. IV, Triquinoyl octahydrate; V, croconic acid trihydratc; VI, leuconic acid pentahydrate.

Figure 2.

Figure 2.. Ultraviolet spectrograms of materials.

I. Hexahydroxybenzene. Curve A, 7.39 mg of I in 100 ml of 6_N_ HCl in methanol, 3 min after dissolution; λmax at 278 m_μ_. Curve B, 67 mg of the hexaacetate of I in 200 ml of glacial acetic acid, 10 min after dissolution; λmax at 263 m_μ_. II. Tetrahydroxyquinone. Curve A, 3.82 mg of II in 1000 ml of 2_N_ aqueous HCl, 24 hr after dissolution; λmax at 308 m_μ_. Curve B, 7 mg of II in 1000 ml of methanol, 30 min after dissolution; λmax at 312 m_μ_. III. Rhodizonic acid dihydrate. Curve A, 6.87 mg of III in 1000 ml of 2_N_ aqueous HCl 24 hr after dissolution; λmax at 235 m_μ_ and at 319 m_μ_. Curve B, 8.58 mg of III in 1000 ml of methanol, 5 min after dissolution; λmax at 235 m_μ_ and at 323 m_μ_. In the visible region, III shows absorption at 443 m_μ_ and at 487 m_μ_ (sh). IV. Triquinoyl octahydrate. 3.24 mg of IV in 100 ml of 2_N_ aqueous NaCl 1.5 hr after dissolution; λmax at 267 mμ. In the visible region, IV shows marked absorption at 363 m_μ_, 440 m_μ_ (sh) and 480 m_μ_. V. Croconic acid trihydrate. 5.87 mg of V in 100 ml of 2_N_ aqueous HCl, 10 min after dissolution; λmax at 231 m_μ_ and at 298 m_μ_. VI. Leuconic acid pentahydrate. 156.45 mg of VI in 50 ml of water, 5 min after dissolution; λmax at 328 m_μ_.

Figure 2.

Figure 2.. Ultraviolet spectrograms of materials.

I. Hexahydroxybenzene. Curve A, 7.39 mg of I in 100 ml of 6_N_ HCl in methanol, 3 min after dissolution; λmax at 278 m_μ_. Curve B, 67 mg of the hexaacetate of I in 200 ml of glacial acetic acid, 10 min after dissolution; λmax at 263 m_μ_. II. Tetrahydroxyquinone. Curve A, 3.82 mg of II in 1000 ml of 2_N_ aqueous HCl, 24 hr after dissolution; λmax at 308 m_μ_. Curve B, 7 mg of II in 1000 ml of methanol, 30 min after dissolution; λmax at 312 m_μ_. III. Rhodizonic acid dihydrate. Curve A, 6.87 mg of III in 1000 ml of 2_N_ aqueous HCl 24 hr after dissolution; λmax at 235 m_μ_ and at 319 m_μ_. Curve B, 8.58 mg of III in 1000 ml of methanol, 5 min after dissolution; λmax at 235 m_μ_ and at 323 m_μ_. In the visible region, III shows absorption at 443 m_μ_ and at 487 m_μ_ (sh). IV. Triquinoyl octahydrate. 3.24 mg of IV in 100 ml of 2_N_ aqueous NaCl 1.5 hr after dissolution; λmax at 267 mμ. In the visible region, IV shows marked absorption at 363 m_μ_, 440 m_μ_ (sh) and 480 m_μ_. V. Croconic acid trihydrate. 5.87 mg of V in 100 ml of 2_N_ aqueous HCl, 10 min after dissolution; λmax at 231 m_μ_ and at 298 m_μ_. VI. Leuconic acid pentahydrate. 156.45 mg of VI in 50 ml of water, 5 min after dissolution; λmax at 328 m_μ_.

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