| 单词 | β-ionone |
| 释义 | > as lemmasβ-ionone 1. Frequently 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; spec. (more fully β-ionone) a compound that arises as a product of ψ-ionone (see sense 2) in the synthesis of vitamin A. Also: any substituted derivative of these compounds.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. ΘΚΠ the world > physical sensation > smell and odour > fragrance > [noun] > fragrant substance or perfume > other substances used for essence of mirbane1857 heliotropin1881 linalool1891 ionone1893 note1905 isolate1923 hydroxycitronellal1929 rush1977 the world > matter > chemistry > organic chemistry > ketones > [noun] > others pyroacetic ether1810 pyroacetic spirit1810 pyroacetic acid1819 margarone1834 oleone1834 stearone1836 acetone1838 valerone1839 benzoin1863 acetophenone1871 anthrone1881 ionone1893 Michler's ketone1897 chalcone1899 butanone1902 butyrophenone1908 alkenone1945 tropolone1945 1893 Bull. Pharmacy 7 552/1 From citral, the specific constituent of lemon oil, he has obtained an isomeric body, called Ionone, which is almost identical in aroma with Irone. 1898 Jrnl. Chem. Soc. 74 i. 376 (title) Resolution of ionone into two structurally identical forms, α-ionone and β-ionone. 1929 Encycl. Brit. VIII. 721/1 Ionone, derived from citral isolated from oil of lemongrass,..is the basis of all violet scents, and perhaps the most important of all synthetic perfumes. 1962 E. T. Theimer et al. in Jrnl. Org. Chem. 27 635/2 We wish to report the isolation and characterization of pure γ-ionone..from commercial products. 2005 New Yorker 14 Mar. 84/3 The scent of freesia..is created by combining two simple molecules: beta-ionone and linalool, both synthetic. < as lemmas |
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