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General structure of 1,2-, 1,3-, and 1,4-dicarbonyls. In organic chemistry, a dicarbonyl is a molecule containing two carbonyl (C=O) groups.Although this term could refer to any organic compound containing two carbonyl groups, it is used more specifically to describe molecules in which both carbonyls are in close enough proximity that their reactivity is changed, such as 1,2-, 1,3-, and 1,4 ...
1,3-dicarbonyl compounds have also been shown to be viable starting materials in place of the α-pyridinium methyl ketone salts. [7] For example, treatment of 1,3-diketone 14 with base in ethanol followed by ammonium acetate, acetic acid, the corresponding enone and a Lewis acid yields 3-acyltriarylpyridines of the form 15.
Interactions between carbonyl groups and other substituents were found in a study of collagen. [3] Substituents can affect carbonyl groups by addition or subtraction of electron density by means of a sigma bond. [4] ΔHσ values are much greater when the substituents on the carbonyl group are more electronegative than carbon. [4] A carbonyl ...
Moreover, multiple other optional domains can also exist within a module like ketoreductase or dehydratase domains which alter the default 1,3-dicarbonyl functionality of the installed ketide by sequential reduction to an alcohol and double bond, respectively. [5] [6] These domains work together like an assembly line. This type of type I PKSs ...
Acidity of diethyl malonate, a 1,3-dicarbonyl compound. The central carbon in 1,3-dicarbonyl compound is known as an activated methylene group. This is because, owing to the structure, the carbon is especially acidic and can easily be deprotonated to form a methylene group. [4]
Many carbonyl compounds exhibit keto–enol tautomerism. This effect is especially pronounced in 1,3-dicarbonyl compounds that can form hydrogen-bonded enols. The equilibrium constant is dependent upon the solvent polarity, with the cis-enol form predominating at low polarity and the diketo form predominating at high polarity.
Dicarbonyl(acetylacetonato)rhodium(I) Dicarbonyldi-μ-chlorodichlorodiplatinum; Dicarbonyltris(triphenylphosphine)ruthenium(0) Dichlororuthenium tricarbonyl dimer; Dicobalt hexacarbonyl acetylene complex; Dicobalt octacarbonyl; Diiron propanedithiolate hexacarbonyl; Dimanganese decacarbonyl; Dirhenium decacarbonyl
Dicobalt octacarbonyl is an organocobalt compound with composition Co 2 (CO) 8.This metal carbonyl is used as a reagent and catalyst in organometallic chemistry and organic synthesis, and is central to much known organocobalt chemistry.