Quinones with Extended Unbranched Side Chains

Quinones with Extended Unbranched Side Chains 

A colourless compound, betulachrysoquinone hemiketal (413), which must be related biogenetically to the sarcodontic acids, has been isolated from wood of Betula lutea inoculated with Phanerochaete chry- 

It is a mixture of the ceriporiones-A (415) and -B (416) which imparts a cherry red colour to the acetone extracts of Ceriporia viridans 155). The mixture [m.p. 149-150 °C Rf 0.46, silica gel (benzene ethyl formate formic acid = 10 5 3)], which has not been separated into its individual components, exhibited absorption maxima at 303 and 463 nm and formed a green monoanion with ammonia, and a blue dianion with aqueous potassium hydroxide. The structures (415) and (416) were deduced from and C-n.m.r. spectra while bearing in mind biogenetic considerations. The position of the side chain double bonds in these pigments, however, awaits further confirmation. 

The ceriporiones are closely related to the antibiotic merulinic acids, e.g. merulinic acid-A (417), which have been isolated from fruit bodies of Merulius tremellosus and Phlebia radiata 275). 

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Quinones with Extended Unbranched Side Chains.183... 

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