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Carbonyls conjugated

For conjugated carbonyl compounds, such as a,) -enones, the orbital diagram would be similar, except for the recognition that the HOMO of the ground state is ij/2 of the enone system, rather than the oxygen lone-pair orbital. The excited states can sometimes be usefully represented as dipolar or diradical intermediates ... [Pg.754]

Coniine, molecular model of. 28 structure of, 294 Conjugate acid, 49 Conjugate base, 49 Conjugate carbonyl addition reaction, 725-729 amines and, 727 enamines and, 897-898 Gilman reagents and, 728-729 mechanism of, 725-726 Michael reactions and, 894-895 water and. 727 Conjugated diene, 482... [Pg.1292]

Claisen rearrangement, 660 conjugate carbonyl addition reaction, 725-726 Curtius rearrangement, 935 cyanohydrin formation, 707 dichlorocarbene formation, 227 Dieckmann cyclization reaction, 892-893... [Pg.1305]

Lewis-acid catalyzed inverse electron-demand Diels-Alder reactions between conjugated carbonyl compounds and simple alkenes and enolethers also allow dihydropyranes to be prepared. SnCU-Catalyzed cycloaddition of... [Pg.123]

In certain cases, Michael reactions can take place under acidic conditions. Michael-type addition of radicals to conjugated carbonyl compounds is also known.Radical addition can be catalyzed by Yb(OTf)3, but radicals add under standard conditions as well, even intramolecularly. Electrochemical-initiated Michael additions are known, and aryl halides add in the presence of NiBr2. Michael reactions are sometimes applied to substrates of the type C=C—Z, where the co-products are conjugated systems of the type C=C—Indeed, because of the greater susceptibility of triple bonds to nucleophilic attack, it is even possible for nonactivated alkynes (e.g., acetylene), to be substrates in this... [Pg.1024]

In the presence of a base such as l,4-diazabicyclo[2.2.2]octane (DABCO) or tri-alkylphosphines, conjugated carbonyl compounds such as esters and amides add to aldehydes via the a-carbon to give a-alkenyl-P-hydroxy esters or amides. This sequence is called the Baylis-Hillman reaction and a simple example is... [Pg.1212]

Ordinary Grignard reagents react with a, -unsaturated carbonyl compounds and afford both 1,2-adduct and 1,4-adduct. However, methylsulfonyhnethylmagnesium bromide or p-tolylsulfonylmethylmagnesium bromide gave only 1,2-adducts in the reaction with conjugated carbonyl compounds such as crotonaldehyde, cinnamaldehyde, trans-4-phenyl-3-buten-2-one, benzalacetophenone and l,5-diphenyl-2,4-pentadien-l-one. [Pg.637]

J. Fastrez, Estimation of the Free Energies of Addition of Nucleophiles to Conjugated Carbonyl Compounds and to Acyl Derivatives, J. Am. Chem. Soc. 1977, 99, 7004. [Pg.40]

The allylic alcohols that are the initial oxidation products can be further oxidized to carbonyl groups by Se02 and the conjugated carbonyl compound is usually isolated. If the alcohol is the desired product, the oxidation can be run in acetic acid, in which case acetate esters are formed. [Pg.1124]

Luche reported that when a zinc-copper couple was used, alkyl halides reacted with conjugated carbonyl compounds and nitriles to give 1,4-addition products in good yields under sonication conditions (Eq. 10.26).57... [Pg.324]

The hydrocyanation of conjugated carbonyl compounds is a related reaction.83 Very often such a conjugated addition is carried out in aqueous conditions. For example, in the pioneer work of Lapworth, hydrocyanation of activated olefins was carried out with KCN or NaCN in aqueous ethanol in the presence of acetic acid (Eq. 10.36).84... [Pg.329]

Zigmantas, D., R. G. Hiller, F. P. Sharpies, H. A. Frank, V. Sundstrom, andT. Poltvka. 2004. Effect of conjugated carbonyl group on photophysical properties of carotenoids. Phys. Chem. Chem. Phys. 6 3009-3016. [Pg.157]

Figure 1 Left illustration of the application of a mask to produce different samples . Right FT-IR images of the carbonyl band of poly(vinyl cinnamate), showing different levels of crosslink density as revealed from a decrease in conjugated carbonyls. Reproduced from Rafferty et al. [9], Copyright 2002, with permission from the Society for Applied Spectroscopy. Figure 1 Left illustration of the application of a mask to produce different samples . Right FT-IR images of the carbonyl band of poly(vinyl cinnamate), showing different levels of crosslink density as revealed from a decrease in conjugated carbonyls. Reproduced from Rafferty et al. [9], Copyright 2002, with permission from the Society for Applied Spectroscopy.

See other pages where Carbonyls conjugated is mentioned: [Pg.197]    [Pg.139]    [Pg.217]    [Pg.99]    [Pg.181]    [Pg.216]    [Pg.11]    [Pg.161]    [Pg.303]    [Pg.1014]    [Pg.894]    [Pg.895]    [Pg.1285]    [Pg.1297]    [Pg.1299]    [Pg.1331]    [Pg.243]    [Pg.637]    [Pg.1039]    [Pg.1039]    [Pg.86]    [Pg.658]    [Pg.392]    [Pg.193]    [Pg.18]    [Pg.73]    [Pg.312]    [Pg.139]    [Pg.209]    [Pg.392]    [Pg.181]   
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Addition reactions conjugated unsaturated carbonyl

Alcohols from conjugated carbonyls

Alcohols, carbonylation conjugate addition

Alkenes conjugated with carbonyl groups

Amine conjugate carbonyl addition

Asymmetric Conjugate Addition with Carbonyls and Imines

Boronic acids, carbonylation conjugate addition

Boronic acids, carbonylation with conjugated ketones

Calculation of the Conjugated Carbonyl Contents

Carbonyl compound by conjugate addition

Carbonyl compounds 1,4-conjugate addition of hydrazones

Carbonyl compounds conjugate addition

Carbonyl compounds conjugated unsaturated

Carbonyl compounds conjugated, addition

Carbonyl compounds conjugated, resonance

Carbonyl compounds conjugation effects

Carbonyl compounds sulfone conjugate additions

Carbonyl conjugate asymmetric arylation

Carbonyl conjugated chains

Carbonyl conjugated double bonds

Carbonyl group conjugated

Carbonyl group, conjugation

Carbonyls asymmetric conjugate addition

Carbonyls conjugate additions, acetylene

Carbonyls conjugated, reaction with

Condensation reactions, carbonyl compounds conjugate addition

Conjugate Addition to Carbonyl Compounds

Conjugate Addition to a,3-Unsaturated Carbonyl Compounds

Conjugate Carbonyl Additions The Michael Reaction

Conjugate addition to unsaturated carbonyl compound

Conjugate carbonyl addition

Conjugate carbonyl addition mechanism

Conjugate carbonyl addition reaction

Conjugated carbonyl compounds

Conjugated carbonyl compounds, epoxidations

Conjugated carbonyl compounds, formation

Conjugated carbonyl compounds, reduction with

Conjugated carbonyl polymers

Conjugated carbonyls, and

Conjugated with carbonyl groups, effect

Conjugation effect on reactivity of carbonyl grou

Double Bonds Conjugated with a Carbonyl Group

Enamines, reaction with conjugated carbonyls

Enone , conjugate carbonyl

Enone , conjugate carbonyl Michael reactions

Enone , conjugate carbonyl addition reactions

Enone , conjugate carbonyl from aldehydes

Enone , conjugate carbonyl from aldol reaction

Enone , conjugate carbonyl from ketones

Enone , conjugate carbonyl reaction with amines

Enone , conjugate carbonyl reaction with water

Enone , conjugate carbonyl synthesis

Enone, conjugate carbonyl addition

Enone, conjugate carbonyl addition Michael reactions

Enone, conjugate carbonyl addition from aldehydes

Enone, conjugate carbonyl addition from aldol reaction

Enone, conjugate carbonyl addition from ketones

Enone, conjugate carbonyl addition reaction with amines

Enone, conjugate carbonyl addition synthesis

Esters conjugation with carbonyl group

Formation of Conjugated Carbonyls

Gilman reagent conjugate carbonyl addition

Hydrocyanation of conjugated carbonyl

Hydrocyanation of conjugated carbonyl compounds

Indoles with conjugated carbonyl compounds

Nucleophilic Addition to Conjugated Carbonyl Compounds

Nucleophilic reactions conjugated carbonyls

Olefins Conjugated to Carbonyl, Nitrile, Nitro

Organocopper reagent, conjugate carbonyl addition reactions

Organocuprates, reaction with conjugated carbonyls

Organolithium reagents, reaction with conjugated carbonyls

Organometallic compounds with conjugated carbonyl

Resonance in conjugated carbonyl compounds

Selectivity control conjugated carbonyl

Unsaturated carbonyl compounds conjugate additions

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