Studies in the biochemistry of micro-organisms. 98. Tritisporin, an anthraquinone colouring matter of Helminthosporium tritici-vulgaris Nisikado: structure and synthesis

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Abstract
The mycelium of laboratory cultures of Helminthosporium tritici-vulgaris Nisikado contains 3 anthraquinone coloring matters: catenarin, tritisporin and helminthosporin. Tritisporin has been synthesized and shown to be [omega] -hydroxycatenarin, i.e. 1,4,5,7-tetrahydroxy-2-hydroxymethylanthraquinone. When catenarin is oxidized with manganese diozide in concentrated sulphuric acid, it gives 8-hydroxycatenarin, i.e. l,4,5,7,8-pentahydroxy-2-methylanthra-quinone.