Xanthohumol is a yellow leaf pigment, present in all hop varieties. I t is a chalkone and isomerizes into a flavanone on alkaline treatment. Xanthohumol has the molecular formula C,,H ,,O ,, contains three active hydrogen atoms, one methoxylgroup, one carbonylgroup and two double bonds. Alkaline hydrolysis of xanthohumol yields p.oxybenzaldehyde, acetic acid arid methoxy-isoprenylphloroglucinol. Xanthohumol is represented by structure IV. (I4) S. M. Mc ELVAIN, The characterization of organic compounds. MacMillan Co New-York, p. 200 (1947).
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