英语词汇“ionone”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典-新都网

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.

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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