Studies in the biochemistry of micro-organisms. 101. The colouring matters of species in the Aspergillus nidulans group. Part 2. Further observations on the structure of asperthecin
- 1 June 1957
- journal article
- research article
- Published by Portland Press Ltd. in Biochemical Journal
- Vol. 66 (2) , 234-237
- https://doi.org/10.1042/bj0660234
Abstract
Asperthecin was shown to be either 3:4: 5:6:7-pentahydrbxy-2-hydroxymethylanthraquinone or 3:4:5:7:8-penta-hydroxy-2-hydroxymethylanthraquinone. It was confirmed that full methylation of polyhydroxyanthraquinones with ethereal diazomethane is greatly facilitated by the addition of methanol to the methylation mixture. The synthesis of 4-carboxy-3:6-dimethoxyphthalic anhydride, 5-carboxy-3:4-dimethoxyphthalic acid and its anhydride and 3:4-dimethoxy-5-methylphthalic acid and its anhydride are described. 5-Carboxy-3;4-dimethoxy-phthalic anhydride was identified as an oxidation product of asperthecin tetra- and penta-methyl ethers.Keywords
This publication has 2 references indexed in Scilit:
- Studies in the biochemistry of micro-organisms. 100. Metabolites of Penicillium atrovenetum G. Smith. Part I. Atrovenetin, a new crystalline colouring matterBiochemical Journal, 1957
- Studies in the biochemistry of micro-organisms. 94. The colouring matters of species in the Aspergillus nidulans group. Part I. Asperthecin, a crystalline colouring matter of Aspergillus quadrilineatus Thom & RaperBiochemical Journal, 1955