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翻译下列句子。My friends look different.___________________________________________翻译下列句子。 My friends look different. ___________________________________________
提问人：网友liuzongshun
发布时间：2022-01-07
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将下列句子翻译成中文 1.Free and esterified, saturated primary alcohols occur widely in natural, e.g., in fruit. Since their odor is relatively weak, their use as components in fragrance compositions is limited. Their use in aroma compositions, especially for fruit flavors, is by far more important (e.g., straight-chain C4-C10 alcohols, isoamyl alcohol). Unsaturated alcohols are most important (e.g., leaf alcohol with its intensely green odor) and may impart characteristic notes to compositions. Naturally occurring fatty alcohols used in the fragrance industry are produced principally by reduction of the methyl esters of corresponding carboxylic acids, which are obtained by transesterification of natural fats and oils with methanol. 2. 2-methylundecanal is produced by two routes: 2-undecanone is converted into its glycidate by reaction with alkyl chloroacetate. Saponification of the glycidate, followed by decarboxylation, yields 2-methylundecanal. The second synthesis is based on the conversion of undecanal into 2-methylene-undecanal by reaction with formaldehyde in the presence of catalytic amounts of amines. Hydrogenation of 2-methyleneundecanal yields methylnonylacetaldehyde. A convenient process starts from 1-decene: hydroformylation gives a mixture consisting mainly of undecanal and 2-methyldecanal. Reaction of the crude product with formaldehyde in the presence of dibutylamine yields a mixture containing over 50% 2-methyleneundecanal. After hydrogenation of double bond, pure 2-methylundecanal is separated from byproducts by fractional distillation.
