Abstract
A mixture of three homologous reducing lipids has been isolated in crystalline form from the unsaponifiable fraction of Neurospora crassa. The crystalline form presented an absorption peak at 290 nm ( E 1% 1 cm = 143). By oxidation with chloroauric acid, a quinone with an absorption maximum at 270 nm ( E 1% 1 cm = 327) was formed. The infrared spectrum showed peaks assigned to hydroxyl, methyl, methylene, aliphatic ether link and aromatic ether link respectively. The NMR spectrum indicated the presence of 2 aromatic, 40 methylenic, 3 methyl, 6 methoxyl and 1 hydroxyl protons respectively. Three compounds were separated by gas-liquid chromatography. Their molecular weights were 448, 462 and 476, respectively, sharing a common stable ion as determined by mass spectrography. A monomethyl ether hydroquinone nucleus with a straight side chain has been proposed as a common structure for the homologous compounds.
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