Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Acetal> ?p ?o }
- Acetal abstract "An acetal is a functional group with the following connectivity R2C(OR')2, where both R' groups are organic fragments. The central carbon atom has four bonds to it, and is therefore saturated and has tetrahedral geometry. The two R'O groups may be equivalent to each other or not. The two R groups can be equivalent to each other (a \"symmetric acetal\") or not (a \"mixed acetal\"), and one or both can even be hydrogen atoms rather than organic fragments. Acetals are formed from and convertible to carbonyl compounds (aldehydes or ketones R2C=O). The term ketal is sometimes used to identify structures associated with ketones rather than aldehydes, and historically, the term acetal was used specifically for the aldehyde cases. Cellulose is a ubiquitous example of an acetal.Formation of an acetal occurs when the hydroxyl group of a hemiacetal becomes protonated and is lost as water. The carbocation ion that is produced is then rapidly attacked by a molecule of alcohol. Loss of the proton from the attached alcohol gives the acetal.Acetals are stable compared to hemiacetals but their formation is a reversible equilibrium as with esters. As a reaction to create an acetal proceeds, water must be removed from the reaction mixture, for example, with a Dean-Stark apparatus, lest it will hydrolyse the product back to the hemiacetal. The formation of acetals reduces the total number of molecules present and therefore is not favourable with regards to entropy. A way to improve this is to use an orthoester as a source of alcohol. Aldehydes and ketones undergo a process called acetal exchange with orthoesters to give acetals. Water produced along with the acetal product is used up in hydrolysing the orthoester and producing more alcohol to be used in the reaction.Most glycosidic bonds in carbohydrates and other polysaccharides are acetal linkages. Acetaldehyde diethyl acetal, sometimes called simply \"acetal\", is an important flavouring compound in distilled beverages.The plastic known as acetal is a polyacetal of formaldehyde.Acetals are used as protecting groups for carbonyl groups in organic synthesis as they are stable with respect to hydrolysis by bases and with respect to many oxidizing and reducing agents. They can either protect the carbonyl in a molecule (by temporarily reacting it with an alcohol) or a diol (by temporarily reacting it with a carbonyl). That is, either the carbonyl, or the alcohols, or both could be part of the molecule whose reactivity is to be controlled.Various specific carbonyl compounds have special names for their acetal forms. For example, an acetal formed from formaldehyde is sometimes called a \"formal\" or the methylenedioxy group. The acetal formed from acetone is sometimes called an acetonide.".
- Acetal thumbnail Ketal_Structural_Formulae_V.1.png?width=300.
- Acetal wikiPageID "89092".
- Acetal wikiPageLength "7131".
- Acetal wikiPageOutDegree "71".
- Acetal wikiPageRevisionID "698942365".
- Acetal wikiPageWikiLink 1,1-Diethoxyethane.
- Acetal wikiPageWikiLink 1,3,5-Trioxane.
- Acetal wikiPageWikiLink Acetal.
- Acetal wikiPageWikiLink Acetone.
- Acetal wikiPageWikiLink Acetonide.
- Acetal wikiPageWikiLink Acid.
- Acetal wikiPageWikiLink Alcohol.
- Acetal wikiPageWikiLink Aldehyde.
- Acetal wikiPageWikiLink Aluminium_oxide.
- Acetal wikiPageWikiLink Aminal.
- Acetal wikiPageWikiLink Azeotropic_distillation.
- Acetal wikiPageWikiLink Base_(chemistry).
- Acetal wikiPageWikiLink Carbocation.
- Acetal wikiPageWikiLink Carbohydrate.
- Acetal wikiPageWikiLink Carbonyl.
- Acetal wikiPageWikiLink Catalysis.
- Acetal wikiPageWikiLink Category:Acetals.
- Acetal wikiPageWikiLink Category:Functional_groups.
- Acetal wikiPageWikiLink Category:Protecting_groups.
- Acetal wikiPageWikiLink Cellulose.
- Acetal wikiPageWikiLink Chemical_equilibrium.
- Acetal wikiPageWikiLink Dean-Stark_apparatus.
- Acetal wikiPageWikiLink Deprotonation.
- Acetal wikiPageWikiLink Dimethoxymethane.
- Acetal wikiPageWikiLink Diol.
- Acetal wikiPageWikiLink Dioxolane.
- Acetal wikiPageWikiLink Distilled_beverage.
- Acetal wikiPageWikiLink Entropy.
- Acetal wikiPageWikiLink Ester.
- Acetal wikiPageWikiLink Formaldehyde.
- Acetal wikiPageWikiLink Functional_group.
- Acetal wikiPageWikiLink Glycosidic_bond.
- Acetal wikiPageWikiLink Hemiacetal.
- Acetal wikiPageWikiLink Hemiaminal.
- Acetal wikiPageWikiLink Hydrochloric_acid.
- Acetal wikiPageWikiLink Hydrolysis.
- Acetal wikiPageWikiLink Hydroxyl.
- Acetal wikiPageWikiLink Ketone.
- Acetal wikiPageWikiLink Metaldehyde.
- Acetal wikiPageWikiLink Methylenedioxy.
- Acetal wikiPageWikiLink Molecular_sieve.
- Acetal wikiPageWikiLink Mozingo_reduction.
- Acetal wikiPageWikiLink Nucleophilic_addition.
- Acetal wikiPageWikiLink Organic_reaction.
- Acetal wikiPageWikiLink Organic_synthesis.
- Acetal wikiPageWikiLink Orthoester.
- Acetal wikiPageWikiLink Oxonium_ion.
- Acetal wikiPageWikiLink Paraldehyde.
- Acetal wikiPageWikiLink Polyoxymethylene.
- Acetal wikiPageWikiLink Polysaccharide.
- Acetal wikiPageWikiLink Protecting_group.
- Acetal wikiPageWikiLink Protonation.
- Acetal wikiPageWikiLink Resonance_(chemistry).
- Acetal wikiPageWikiLink Saturation_(chemistry).
- Acetal wikiPageWikiLink Tetrahedral_molecular_geometry.
- Acetal wikiPageWikiLink Thioacetal.
- Acetal wikiPageWikiLink Thioketal.
- Acetal wikiPageWikiLink File:Acetalisation.png.
- Acetal wikiPageWikiLink File:Ketal_Structural_Formulae_V.1.png.
- Acetal wikiPageWikiLinkText "Acetal".
- Acetal wikiPageWikiLinkText "acetal".
- Acetal wikiPageWikiLinkText "ketal (acetal)".
- Acetal align "center".
- Acetal caption "Aldehyde to acetal conversion".
- Acetal caption "Ketone to ketal conversion".
- Acetal captionAlign "center".
- Acetal direction "vertical".
- Acetal headerAlign "center".
- Acetal image "Acetal formation 2.png".
- Acetal image "Ketal formation.png".
- Acetal totalWidth "428".
- Acetal wikiPageUsesTemplate Template:Distinguish.
- Acetal wikiPageUsesTemplate Template:For.
- Acetal wikiPageUsesTemplate Template:Multiple_image.
- Acetal subject Category:Acetals.
- Acetal subject Category:Functional_groups.
- Acetal subject Category:Protecting_groups.
- Acetal hypernym Group.
- Acetal type Band.
- Acetal type Group.
- Acetal type Acetal.
- Acetal type Ether.
- Acetal type Group.
- Acetal type Reagent.
- Acetal type Redirect.
- Acetal type Thing.
- Acetal type Concept.
- Acetal comment "An acetal is a functional group with the following connectivity R2C(OR')2, where both R' groups are organic fragments. The central carbon atom has four bonds to it, and is therefore saturated and has tetrahedral geometry. The two R'O groups may be equivalent to each other or not. The two R groups can be equivalent to each other (a \"symmetric acetal\") or not (a \"mixed acetal\"), and one or both can even be hydrogen atoms rather than organic fragments.".
- Acetal label "Acetal".
- Acetal differentFrom Acetyl.
- Acetal sameAs Q421103.
- Acetal sameAs أسيتال.
- Acetal sameAs Acetal.
- Acetal sameAs Acetale.