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aldehyde
(redirected from Alkanal)

   Also found in: Medical, Wikipedia, Hutchinson 0.08 sec.
aldehyde (ăl`dəhīd) [alcohol + New Lat. dehydrogenatus=dehydrogenated], any of a class of organic compounds that contain the carbonyl group carbonyl group (kär`bənĭl)
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, and in which the carbonyl group is bonded to at least one hydrogen; the general formula for an aldehyde is RCHO, where R is hydrogen or an alkyl or aryl group. Aldehydes are formed by partial oxidation of primary alcohols and form carboxylic acids when they are further oxidized. The common name for an aldehyde is often derived from the name of the acid it forms; the IUPAC name is usually derived from the name of the alcohol from which it is formed. Low molecular weight aldehydes, e.g., formaldehyde formaldehyde (fôrmăl`dəhīd'), HCHO, the simplest aldehyde .
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 and acetaldehyde acetaldehyde (ăs'ĭtăl`dəhīd) or ethanal
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, have sharp, unpleasant odors; higher molecular weight aldehydes, e.g., benzaldehyde benzaldehyde (bĕnzăl`dəhīd) or benzenecarbonal
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 and furfural furfural (fûr`fərəl) or furfuraldehyde
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, have pleasant, often flowery, odors and are found in the essential oils essential oils, volatile oils that occur in plants and in general give to the plants their characteristic odors, flavors, or other such properties. Essential oils are found in various parts of the plant body (in the seeds, flowers, bark, or leaves) and are also
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 of certain plants. Aldehydes are used for the manufacture of synthetic resins, e.g., bakelite, and for making dyestuffs, flavorings, perfumes, and other chemicals. Some are used as preservatives and disinfectants.

aldehyde

Any of a class of organic compounds that contain a carbonyl group (−C=O; see functional group) in which the carbon atom is bonded to at least one hydrogen atom. Many have characteristic odours. Oxidation (see oxidation-reduction) of aldehydes yields acids; reduction produces alcohols. They participate in many chemical reactions and readily undergo polymerization into chains containing tens of thousands of the monomer molecule. The combination of aldehydes (e.g., formaldehyde) with other molecules results in several familiar plastics. Many aldehydes are large-scale industrial materials, useful as solvents, monomers, perfume ingredients, and intermediates. Many sugars are aldehydes, as are several natural and synthetic hormones and compounds such as retinal (a derivative of vitamin A, important in vision) and pyridoxal phosphate (a form of vitamin B6).


aldehyde
1. any organic compound containing the group -CHO. Aldehydes are oxidized to carboxylic acids and take part in many addition reactions
2. consisting of, containing, or concerned with the group -CHO


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