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Hydrogenations alkenes

A number of later studies on hydrogen exchange reactions showed that hydrogen could be activated by gold surfaces [205-207]. [Pg.477]

Gas phase hydrogenation was also studied for alkene or alkyne substrates. Supported gold or Pt/Au alloys delivered interesting results [210, 211]. [Pg.477]

After compiling many results obtained in similar studies of different substrates (alkenes, dienes, alkynes and so on), the results cannot be correlated to draw definitive conclusions due to the wide variety of parameters that can influence the reaction (substrates, catalyst precursors, supports, pressure, temperature and so on) [9, 208-214]. This is maybe the main reason why there are no clear mechanistic explanations for this simple reaction, unlike homogeneous gold-catalyzed processes. [Pg.478]


A well-understood catalytic cycle is tliat of the Wilkinson alkene hydrogenation (figure C2.7.2) [2]. Like most catalytic cycles, tliat shown in figure C2.7.2 is complex, involving intennediate species in tire cycle (inside tire dashed line) and otlier species outside tire cycle and in dead-end patlis. Knowledge of all but a small number of catalytic cycles is only fragmentary because of tire complexity and because, if tire catalyst is active, tire cycle turns over rapidly and tire concentrations of tire intennediates are minute thus, tliese intennediates are often not even... [Pg.2699]

In the mechanism for alkene hydrogenation shown m Figure 6 1 hydrogen atoms are transferred from the catalyst s surface to the alkene Although the two hydrogens are not transferred simultaneously they both add to the same face of the double bond... [Pg.234]

Like the hydrogenation of alkenes hydrogenation of alkynes is a syn addition CIS alkenes are intermediates in the hydrogenation of alkynes to alkanes... [Pg.375]

Alkynes react with many of the same electrophilic reagents that add to the carbon-carbon double bond of alkenes Hydrogen halides for example add to alkynes to form alkenyl halides... [Pg.377]

When a hydrogen halide adds to an alkene, hydrogen adds to the carbon of the alkene that has the greater number of hydrogens attached to it, and the halogen to the carbon that has the fewer hydrogens. [Pg.239]

Both objectives have been met by designing special hydrogenation catalysts. The most frequently used one is the Lindlar catalyst, a palladium on calcium carbonate combination to which lead acetate and quinoline have been added. Lead acetate and quinoline partially deactivate ( poison ) the catalyst, making it a poor catalyst for alkene hydrogenation while retaining its ability to catalyze the addition of H2 to the triple bond. [Pg.375]

The reverse reaction (formation of metal alkyls by addition of alkenes to M-H) is the basis of several important catalytic reactions such as alkene hydrogenation, hydroformylation, hydroboration, and isomerization. A good example of decomposition by y3-elimination is the first-order intramolecular reaction ... [Pg.926]

Alkene hydrogenation occurs on the surface of metal particles which act as a catalyst for the reaction. This usually means that both hydrogens are added to the same face of the alkene syn addition). [Pg.114]

Platinum and palladium are the most common catalysts for alkene hydrogenations. Palladium is normally used as a very fine powder supported" on an inert material such as charcoal (Pd/C) to maximize surface area. Platinum is normally used as PtC, a reagent called Adams catalyst after its discoverer, Roger Adams. [Pg.230]

Figure 7.7 MECHANISM Mechanism of alkene hydrogenation. The reaction takes place with syn stereochemistry on the surface of insoluble catalyst particles. Figure 7.7 MECHANISM Mechanism of alkene hydrogenation. The reaction takes place with syn stereochemistry on the surface of insoluble catalyst particles.
Complexes of bulky substituted phenanthrolines [Pt(N-N)LX2] (L, X both monodentate N-N, e.g. 2,9-dimethyl- 1,10-phenanthroline) can be 5-coordinate tbp when a good 7r-acceptor (e.g. C2H4) is present or 4-coordinate with monodentate phenanthrolines. Hartree-Fock calculations indicate that the 7r-acceptors reduce the electron density at platinum so that the metal can accept charge from another donor. Species of this kind may be involved in alkene hydrogenation [138]. [Pg.236]

This section contains dehydrogenations to form alkenes and unsaturated ketones, esters and amides. It also includes the conversion of aromatic rings to alkenes. Reduction of aryls to dienes is found in Section 377 (Alkene-Alkene). Hydrogenation of aryls to alkanes and dehydrogenations to form aryls are included in Section 74 (Alkyls from Alkenes). [Pg.219]

Scheme 4.17 Simplified alkene hydrogenation mechanism using Wilkinson s catalyst... Scheme 4.17 Simplified alkene hydrogenation mechanism using Wilkinson s catalyst...
The inhibiting effect of DHQ and its NH3 product was studied on the final step in the network of Fig. 2, the alkene hydrogenation. To avoid confusion with the PCHE olefin formed from DHQ, cyclohexene (CHE) was used as the reactant, and pentylamine (PA) was used as the source of NH3. When the hydrogenation of CHE is performed in the presence of NH3, we have... [Pg.93]

Drivers for Performing Conjugated Alkene Hydrogenation in Micro Reactors... [Pg.631]

Beneficial Micro Reactor Properties for Conjugated Alkene Hydrogenation... [Pg.632]

Conjugated Alkene Hydrogenation Investigated in Micro Reactors Cas/liquid reaction 19 [CL 19) Hydrogenation of Z-(a)-acetamidocinnamic methyl ester... [Pg.632]


See other pages where Hydrogenations alkenes is mentioned: [Pg.211]    [Pg.234]    [Pg.234]    [Pg.239]    [Pg.333]    [Pg.211]    [Pg.234]    [Pg.234]    [Pg.272]    [Pg.272]    [Pg.101]    [Pg.114]    [Pg.229]    [Pg.229]    [Pg.231]    [Pg.231]    [Pg.87]    [Pg.47]    [Pg.77]    [Pg.95]    [Pg.110]    [Pg.226]    [Pg.631]    [Pg.170]    [Pg.431]   
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Activated alkenes, hydrogenation

Addition of Hydrogen Halides to Alkenes

Addition of a Hydrogen Halide to an Alkene

Addition of hydrogen atoms to alkenes

Addition of hydrogen fluonde to alkenes

Addition of hydrogen halides or halogens to alkenes

Addition of hydrogen to alkenes and alkynes catalytic hydrogenation

Adsorption alkene hydrogenation

Alcohols alkene hydrogenation

Alkane derivatives alkene hydrogenation

Alkanes Alkene" hydrogenation mechanism

Alkanes from alkene hydrogenation

Alkanes hydrogenation of alkenes

Alkene (also hydrogenation, catalytic

Alkene Epoxidation with Hydrogen Peroxide - in the Presence of Further Catalysts

Alkene Hydrogenation with Iridium Catalysts

Alkene Hydrogenation with Organocatalysts

Alkene Hydrogenation with Titanium and Zirconium Catalysts

Alkene aromatic hydrogenation

Alkene complexes hydrogenation

Alkene hydrogenated bromo

Alkene hydrogenated chloro

Alkene hydrogenation catalysis

Alkene hydrogenation inhibitor

Alkene hydrogenation reaction

Alkene hydrogenation, photo

Alkene metathesis/hydrogenation

Alkene reaction with hydrogen

Alkene, hydrogenation and isomerization

Alkenes acidic hydrogen

Alkenes addition of hydrogen

Alkenes addition of hydrogen halides

Alkenes addition reactions with hydrogen halides

Alkenes and Hydrogen

Alkenes asymmetric hydrogenation

Alkenes biphasic hydrogenation

Alkenes by hydrogen peroxide

Alkenes by nitriles and hydrogen peroxide

Alkenes carbon-hydrogen stretch

Alkenes catalytic hydrogenation

Alkenes continued) hydrogen halides

Alkenes continued) hydrogenation

Alkenes cyclic, hydrogenation

Alkenes from transfer hydrogenation

Alkenes homogeneous catalytic hydrogenation

Alkenes hydrogen availability

Alkenes hydrogen bromide addition

Alkenes hydrogen halides

Alkenes hydrogen pressure effect

Alkenes hydrogen-terminated

Alkenes hydrogenation as measure of stability

Alkenes hydrogenation with homogeneous

Alkenes hydrogenation, ionic

Alkenes in hydrogenation

Alkenes intramolecular hydrogen bonding

Alkenes of hydrogen halides

Alkenes oxidation with alkaline hydrogen peroxide

Alkenes oxidation with hydrogen peroxide

Alkenes radical addition of hydrogen bromid

Alkenes reaction with hydrogen peroxide

Alkenes reaction with hydrogen sulfide

Alkenes rhodium hydrogenation

Alkenes selective hydrogenation

Alkenes transfer hydrogenation

Alkenes with hydrogen halides

Alkenes with hydrogen halides, free-radical

Alkenes with hydrogen halides, polar

Alkenes with hydrogen sulfide

Alkenes, addition reactions Hydrogenation

Alkenes, epoxidation transfer hydrogenation

Alkenes, hydrogenation alkene exchange mechanism

Alkenes, hydrogenation dissociative chemisorption

Alkenes, hydrogenation double-bond migration

Alkenes, hydrogenation exothermicity

Alkenes, hydrogenation mechanism

Alkenes, reductive coupling hydrogen

Alkenes, reductive coupling hydrogenation

Alkenes, viii hydrogenation reactions

Alkenic hydrogens, definition

Allenes hydrogenation to alkenes

Applications in Enantioselective Hydrogenation of Alkenes

Aprotic solvents alkene hydrogenation

Asymmetric catalysis alkene hydrogenation

Beneficial Micro Reactor Properties for Alkene Aromatic Hydrogenation

Beneficial Micro Reactor Properties for Conjugated Alkene Hydrogenation

Carbocation Rearrangements in Hydrogen Halide Addition to Alkenes

Carbon—hydrogen bonds alkene reactions

Catalyst for adding hydrogen fluonde to alkenes

Catalysts alkene hydrogenation

Catalysts for alkene hydrogenation

Catalystsfor adding hydrogen fluonde to alkenes

Catalytic hydrogenation of alkenes

Compounds Peroxide, hydrogen, reaction with alkenes

Conjugated Alkene Hydrogenation Investigated in Micro Reactors

Cyclic alkenes, hydrogenation stereoselective

Dienes alkene hydrogenation

Direct hydrogenation, alkene

Disubstituted alkenes, hydrogenation

Double bonds, alkene hydrogenation

Drivers for Performing Conjugated Alkene Hydrogenation in Micro Reactors

Electrophilic Addition of a Hydrogen Halide to an Alkene

Electrophilic addition of hydrogen halides to alkenes

Enantioselective Alkene Hydrogenation Monodentate Ligands

Enantioselective Hydrogenation of Alkenes

Enantioselective Hydrogenation of Alkenes with Ferrocene-Based Ligands

Enantioselective Hydrogenation of Unfunctionalized Alkenes

Enantioselective hydrogenation alkene

For additions of hydrogen fluonde to alkenes

Free radical addition of hydrogen bromide to alkene

Hammond postulate alkene hydrogenation

Homogeneous Hydrogenation of Alkenes

Homogeneous catalysis alkene hydrogenation

Homogeneous catalysis, of alkene hydrogenation

Homogeneous hydrogenation alkene

Homogeneous rhodium catalyzed alkene hydrogenations

Hydrogen alkene epoxidation

Hydrogen atom alkenes

Hydrogen bromide alkenes

Hydrogen bromide free-radical addition, alkenes

Hydrogen bromide reaction with alkenes

Hydrogen bromide to alkenes

Hydrogen bromide, addition to alkenes

Hydrogen bromide, anti-Markovnikov addition alkenes

Hydrogen chloride alkenes

Hydrogen chloride to alkenes

Hydrogen halides addition to alkenes

Hydrogen halides reactions with alkenes

Hydrogen halides to alkenes

Hydrogen peroxide alkene

Hydrogen peroxide with alkenes

Hydrogen sulfide, addition alkenes

Hydrogen-Alkene Titration

Hydrogenation II Alkenes and Dienes

Hydrogenation alkene mixtures

Hydrogenation alkene stability and

Hydrogenation alkene, -NORPHOS

Hydrogenation alkenes and

Hydrogenation alkenes and alkynes

Hydrogenation alkenes, stability

Hydrogenation conjugated alkenes

Hydrogenation halogenated alkenes

Hydrogenation internal alkenes

Hydrogenation of Alkenes and Dienes

Hydrogenation of Alkenes and Ketones

Hydrogenation of Alkenes or Alkynes

Hydrogenation of Alkenes, Alkynes, and Arenes

Hydrogenation of Alkenes, Ketones, and Imines

Hydrogenation of Simple Alkenes and Arenes

Hydrogenation of Substituted Alkenes

Hydrogenation of alkenes

Hydrogenation of alkenes and alkynes

Hydrogenation of alkenes with

Hydrogenation of alkynes to -alkenes

Hydrogenation of electron-deficient alkenes

Hydrogenation of n-Alkenes

Hydrogenation reactions of alkenes

Hydrogenation terminal alkenes

Hydrogenation, catalytic alkenes catalyst reactivity

Hydrogenation, catalytic alkenes, stereoselectivity

Hydrogenation, catalytic bond isomerization with alkenes

Hydrogenation, catalytic bond migration with alkenes

Hydrogenation, catalytic, alkene asymmetric catalysts

Hydrogenation, catalytic, alkene catalyst

Hydrogenation, catalytic, alkene catalyst types

Hydrogenation, catalytic, alkene chiral ligands

Hydrogenation, catalytic, alkene compatibility

Hydrogenation, catalytic, alkene conjugated compounds

Hydrogenation, catalytic, alkene enantioselectivity

Hydrogenation, catalytic, alkene formation

Hydrogenation, catalytic, alkene functional group

Hydrogenation, catalytic, alkene heterogeneous, mechanism

Hydrogenation, catalytic, alkene homogeneous catalysts

Hydrogenation, catalytic, alkene homogenous, mechanism

Hydrogenation, catalytic, alkene mechanism

Hydrogenation, catalytic, alkene poisoned catalyst

Hydrogenation, catalytic, alkene poisons

Hydrogenation, catalytic, alkene selectivity

Hydrogenation, catalytic, alkene selectivity with

Hydrogenation, catalytic, alkene solvent effects

Hydrogenation, catalytic, alkene sulfur compounds

Hydroperoxides, from alkenes, with hydrogen

Hydroperoxides, from alkenes, with hydrogen peroxide

Inhibiting alkene hydrogenation

Isomerization, alkenes hydrogenation

Lanthanide compounds, alkene hydrogenation

Mechanism hydrogenation of alkenes

Metal carbonyls alkene hydrogenation

Modern Alchemy Replacing Precious Metals with Iron in Catalytic Alkene and Carbonyl Hydrogenation Reactions

Neighboring groups, alkenes hydrogen

Nickel borides alkene hydrogenation

Nitriles, catalytic hydrogenation alkenes

Nitrosyl hydrogen sulfate addition to alkenes

Of hydrogen fluonde to alkenes

Of hydrogen to alkenes

Olefin (also alkene hydrogenation

Oxirane from alkene/hydrogen

Photocatalytic Hydrogenation of Alkenes

Photocatalytic reactions hydrogenation, alkene

Polymer-supported reagents alkene hydrogenation

Pressure alkene hydrogenation

Rearrangements in hydrogen halide addition to alkenes

Reduction, of alkenes hydrogenation

Relative Reactivities of Alkenes in Wilkinson Homogenous Hydrogenation

Rhodium catalysts alkene hydrogenation, chiral

Rhodium catalyzed hydrogenation alkenes

Rhodium hydrogenation of alkenes

Rhodium, chlorotris hydrogenation alkenes

Rhodium, chlorotris hydrogenation catalyst alkenes

Rhodium-Catalyzed Asymmetric Hydrogenation of Functionalized Alkenes

Ruthenium, chlorohydridotris hydrogenation alkenes

Ruthenium, homogeneous alkene hydrogenation

Ruthenium, homogeneous alkene hydrogenation catalysts from

Shape- and Size-Selective Hydrogenation of Alkenes on the Imprinted Rh Dimer Catalyst

Sodium hydrogen sulfide, reaction with alkenes

Stereochemistry hydrogenation of alkenes

Stereoselective reactions hydrogenation of alkenes

Stereoselectivity addition of hydrogen halides to alkenes

Stereoselectivity alkene hydrogenation

Stereoselectivity hydrogenation of alkenes

Stereospecific reactions hydrogenation of alkenes

Steroids, hydrogenation alkenes

Subject from alkene hydrogenation

Tandem alcohol oxidation, alkene hydrogenation

Tetra-substituted alkenes, hydrogenation

The Addition of Hydrogen to an Alkene

The catalytic hydrogenation and chemical reduction of alkenes

The other Bisphosphine Ligands for Enantioselective Alkene Hydrogenation

Transfer hydrogenation conjugated alkene bonds

Transfer hydrogenation of alkenes

Wilkinson complex, alkene hydrogenation

Ziegler-Natta catalysts alkene hydrogenation

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