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| Section2 = |Section3= }} Sorbic acid, or 2,4-hexadienoic acid, is a natural organic compound used as a food preservative. It has the chemical formula C6H8O2. It is a colourless solid that is slightly soluble in water and sublimes readily. It was first isolated from the unripe berries of the rowan tree (''Sorbus aucuparia''), hence its name. ==Production== The traditional route to sorbic acid involves condensation of malonic acid and trans-butenal. It can also be prepared from isomeric hexadienoic acids, which are available via a nickel-catalyzed reaction of allyl chloride, acetylene, and carbon monoxide. The route used commercially, however, is from crotonaldehyde and ketene.〔''Ashford's Dictionary of Industrial Chemicals'', Third edition, 2011, page 8482〕 An estimated 30,000 tons are produced annually.〔Erich Lück, Martin Jager and Nico Raczek "Sorbic Acid" in ''Ullmann's Encyclopedia of Industrial Chemistry'', Wiley-VCH, Weinheim, 2000.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sorbic acid」の詳細全文を読む スポンサード リンク
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