Chlorinated anthraquinones structures

Most organohalogens produced by fungi have an aromatic structure important groups include the chlorinated anisyl metabolites, drosophilins, and other chlorinated hydroquinone methyl ethers, chlorinated sesquiterpenens, chlorinated anthraquinones and strobulirins [72]. 

A synthesis of the chlorinated angucycline antibiotic BE-23254 (1686), which was isolated from Streptomyces sp. A 23254, has confirmed the structure of this benz[a anthraquinone derivative (1644,1939,1940). Two detailed examinations of the rare Australian soil actinomycete Kibdelosporangium sp. uncovered a series of... 

A second large group of polyketide metabolites that have been isolated from lichens are heptaketide xanthones. Their structures are mainly based on norli-chexanthone (7.54). An interesting feature of these compounds is the presence of chlorine in several of the metabolites. Lichens also produce some anthraquinone pigments, exemplified by physcion (7.6) from Xanthora species. 

A great variety of dyes have been prepared by fusing with an alkali derivatives of anthraquinone which contain chlorine, alkyl, and other radicals. Condensation in other ways than those illustrated above take place and compounds with very complex structures are obtained. Indigo is the most important vat dye its structure and synthesis are described later (667). 

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