Xerocomorubin
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| Identifiers | |
|---|---|
| Properties | |
| C18H10O8 | |
| Molar mass | 354.270 g·mol−1 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Xerocomorubin is a pigment from the fungus group, the Boletales. It is the oxidized form of isoxerocomic acid.[1] Air oxidation is responsible its formation, and oxidizes faster to a similar pulvinic acid type pigment oxidized variant, variegatorubin.[2][3] The long wavelength has an absorption at 497 nm, 106 nm higher than its precursor isoxerocomic acid. Synthesis experiments have shown tetra-acetylation by acetic anhydride and sulphuric acid. Although xerocomorubin and variegatorubin give off the same deep red color and could simultaneously occur in a mushroom, extracts from the deep red colored mushroom Boletus rubellus Krombh. identified only variegatorubin by t.l.c, leading to the question the natural abundance of xerocomorubin.
References
- ^ Gill, M., and Steglich, W. (1987) Pigments of fungi (Macromycetes). Prog Chem Org Nat Prod 51: 1–317.
- ^ Gill, M., and Steglich, W. (1987) Pigments of fungi (Macromycetes). Prog Chem Org Nat Prod 51: 1–317.
- ^ Edwards and Gill (1973) Constituents of the Higher Fungi. Part X1l.l Identification of lnvolutin as (-)-cis-5-(3,4-Dihydroxyphenyl)-3,4-dihydroxy-2-(4-hydroxyphenyl)-cyclopent-2-enone and Synthesis of (+)-cis-lnvolutin Trimethyl Ether from Isoxerocomic Acid Derivatives