Information om | Engelska ordet ENONE

Exempel på hur man kan använda ENONE i en mening

• In the reaction depicted below, the Gilman reagent is a methylating reagent reacting with an alkyne in a conjugate addition, and the ester group forms a cyclic enone.
• An aldol condensation is a condensation reaction in organic chemistry in which two carbonyl moieties (of aldehydes or ketones) react to form a β-hydroxyaldehyde or β-hydroxyketone (an aldol reaction), and this is then followed by dehydration to give a conjugated enone.
• In the oxy-Cope rearrangement, a hydroxyl group is added at C3 forming an enal or enone after keto-enol tautomerism of the intermediate enol:.
• The phenoxide attacks the enone at the beta position, and the alkene directly attacks hydrogen peroxide from the alpha position, forming the dihydroflavonol.
• Herein, treatment of the enone starting material 13 with organocatalyst 14 yielded intermediate 15 via conjugate addition.
• Enone–alkene cycloadditions - photochemical reaction of an enone with an alkene to give a cyclobutene ring unit.
• Substrates include a large variety of aryl-aliphatic, di-aliphatic, di-aryl, α,β unsaturated enone and ynone systems, as well as ketones containing heteroatoms.
• The reaction involves addition of a sulfur ylide to a ketone, aldehyde, imine, or enone to produce the corresponding 3-membered ring.
• Biosynthesitic studies show that the benzoic ring is produced from pyruvate and acetate via the TCA cycle, while the C-17 tetracyclic enone acid core is produced from the non-mevalonate terpenoid pathway.
• At room temperature it produces a diastereomeric mixture of threo (63%) and erythro (19%) β-hydroxyketone as well as 6% of the exocyclic, enone condensation product.
• As an enone, cyclohexenone is easily adapted to Michael addition with nucleophiles (such as enolates or silyl enol ethers) or, it could be employed by a Diels-Alder reaction with electron-rich dienes.
• In the example below, cuprate addition-elimination generates the transient enone 1, which rearranges to spirocycle 2.
• At this point, the enone forms an exciplex with the ground state alkene, eventually giving the triplet diradical.
• These proposed radicals could also be stabilized through the captodative effect, as they are situated between the enone and sp3-hybridized oxygen of the butenolides.
• The conversion of cholestanol to cholesterol was already demonstrated by oxidation of the ketone, bromination to the bromoketone and elimination to the enone.
• Halogenation with phosphorus tribromide converts the enone to the enol bromide and the acid to the acyl halide; mild base hydrolyzes the latter back to the free acid, giving (2).
• This intermediate was then transformed into a key enone substrate over the course of five steps including Rubottom oxidation, TBS protection of the secondary alcohol, and formation of the exocyclic alkene via a selenoxide rearrangements.
• The enone moiety of biliatresone is particularly reactive, being enhanced by the methylenedioxy, methoxy and hydroxy groups, and undergoes ready Michael addition of water and methanol.
• The carboxylic acid lactonizes to the gbl ring, while dehydration of the 5β-hydroxyl group leads to the conjugated enone (10).

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