Chemistry:2,3,5,7-Tetrahydroxy-1,4-naphthalenedione
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| Preferred IUPAC name
2,3,5,7-Tetrahydroxynaphthalene-1,4-dione | |
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3D model (JSmol)
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| Properties | |
| C10H6O6 | |
| Molar mass | 222.15 g/mol |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
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2,3,5,7-Tetraahydroxy-1,4-naphthalenedione, also called 2,3,5,7-tetrahydroxynaphthoquinone or spinochrome B, is an organic compound with formula C10H6O4, formally derived from 1,4-naphthoquinone through the replacement of four hydrogen atoms by hydroxyl (OH) groups.
Spinochrome B occurs naturally as pigment in the shell and spines of sea urchins such as the Japanese dull red species aka-uni (Pseudocentrotus depressus), the greenish-black murasaki-uni (Heliocidaris crassispina), and the brown bafun-uni (Strongylocentrotus pulcherrimus).[1][2] It is soluble in methanol and crystallizes as bright red needles that sublime above 200 °C.[2]
The compound gives a greenish yellow solution when treated with sodium hydroxide, a green solution with ferric chloride, and a green precipitate with lead acetate. It forms a fourfold acetate ester, C10H2O2(CH3COO)4, that crystallizes from methanol as yellow needles that melt at 157 °C.[2]
See also
- Hexahydroxynaphthoquinone (spinochrome E)
- 2,3,5,6,8-Pentahydroxy-1,4-naphthalenedione (spinochrome D)
References
- ↑ Chika KURODA and Masae OKAJIMA (1958), Studies on the Derivatives of Naphthoquinones, XIV. The pigments of sea urchins, IX. Proc. Japan Acad., volume 34, pages 616--618. Online version accessed on 2010-02-01. Pigment M2 is drawn as 2,3,6,8-thNQ but that is the same as 2,3,5,7-thNQ. The genus Heliocedaris should be Heliocidaris and the species purcherrmus should be pulcherrimus.
- ↑ 2.0 2.1 2.2 Chika KURODA and Masae OKAJIMA (1967), Studies on the Derivatives of Naphthoquinones, XVIII. The pigments of sea urchins, XIII. Proc. Japan Acad., volume 43, pages 41--44. Online version accessed on 2010-02-01.
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