Cetraric Acid

Title: Cetraric Acid
CAS Registry Number: 489-49-6
CAS Name: 9-(Ethoxymethyl)-4-formyl-3,8-dihydroxy-1,6-dimethyl-11-oxo-11H-dibenzo[b,e][1,4]dioxepin-7-carboxylic acid
Additional Names: cetrarin
Molecular Formula: C20H18O9
Molecular Weight: 402.35
Percent Composition: C 59.70%, H 4.51%, O 35.79%
Literature References: From Iceland moss, Cetraria islandica (L.) Ach., Parmeliaceae. Isoln: Schnedermann, Knopp, Ann. 55, 144 (1845). Structure: Asahina, Asano, Ber. 66, 893 (1933).
Properties: Very bitter prisms from alcohol or acetic acid. Bitterness threshold 1:50,000. Practically insol in hot water, petr ether, benzene, ether, or in cold methanol, alc, acetone and acetic acid. Sol in aq solns of alkalies or their carbonates forming a yellow soln that turns brown on standing.
Status: This monograph has been retired and is no longer subject to revision or update.
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