酮類 Ketones
酮類與醛類非常相似，因為它們的特徵還在於具有雙鍵的氧;然而，這個官能團總是出現在碳鏈中間
而不是末端。
Ketones可以從他們的科學名稱中識別，通常以 “-one”結尾。
精油中常見的酮類是
主要健康影響：
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n chemistry, a ketone /ˈkiːtoʊn/ is a functional group with the structure RC(=O)R’, where R and R’ can be a variety of carbon-containing substituents. Ketones and aldehydes are simple compounds that contain a carbonyl group (a carbon-oxygen double bond). They are considered “simple” because they do not have reactive groups like −OH or −Cl attached directly to the carbon atom in the carbonyl group, as in carboxylic acids containing −COOH. Many ketones are known and many are of great importance in industry and in biology. Examples include many sugars (ketoses) and the industrial solvent acetone, which is the smallest ketone.
The word ketone is derived from Aketon, an old German word for acetone.According to the rules of IUPAC nomenclature, ketones are named by changing the suffix -ane of the parent alkane to -anone. The position of the carbonyl group is usually denoted by a number. For the most important ketones, however, traditional nonsystematic names are still generally used, for example acetone and benzophenone. These nonsystematic names are considered retained IUPAC names,[4] although some introductory chemistry textbooks use systematic names such as “2-propanone” or “propan-2-one” for the simplest ketone (CH3−CO−CH3) instead of “acetone”.