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单词 ionone
释义

ionone

/ˈʌɪənəʊn/
Chemistry
noun
1Frequently with distinguishing Greek letter. Each of a number of fragrant unsaturated isomeric ketones which are products of the breakdown of carotenoids and occur naturally in some essential oils; specifically (more fully β-ionone) a compound that arises as a product of ψ-ionone in the synthesis of vitamin A.
  • The α- and β-ionones are used in perfumery for their odour of violets and roses. They are cyclic ketones, (CH3)3C6H6CHCH·CO·CH3, differing only in the position of the double bond in the —C6H6 ring. γ-Ionone has the double bond outside the ring in a methylene group..
2In full ψ-ionone. An acyclic compound isomeric with α- and β-ionone which can be cyclized to form those compounds and is used in the synthesis of vitamin A.
  • Systematic name: (3E,5E)-6,10-dimethylundeca-3,5,9-trien-2-one; C13H20O..

Origin

Late 19th century; earliest use found in Bulletin Pharmacy. From German Ionon from ancient Greek ἴον violet (probably, like classical Latin viola, a loan from a language of the Mediterranean) + German -on. For the semantic motivation, see note at sense 1.

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更新时间:2024/12/23 18:40:20