Syntheses of the all-trans(E)-forms of the 6-methyl (7b), 7-methyl (7a), and 8-methyl (16) isomers of 13-phenyltrideca-4,6,8,10,12-pentaen-3-one are described. Comparison with asperenone, a pigment isolated from Aspergillus niger and A. awamori establishes structure (16) for the natural product.
G. Pattenden, J. Chem. Soc. C, 1970, 1404 DOI: 10.1039/J39700001404
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