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Conjugate 1,3 dienes

I.l.IJ Reactions nitlr 1,2-, 1.3-. ami 1.4-dienes. The reaction of conjugated dienes with aryl and alkenyl halides can be explained by the following mechanism. Insertion of a conjugated 1.3-diene into an aryl or alkenylpalladium bond gives the T-allvlpalladium complex 243 as an intermediate, which reacts further... [Pg.163]

Nonconjugated perfluorocyclohepta-l,4-diene is oxidized to the corresponding diepoxide by sodium hypobromite [17] (equation 36), whereas the conjugated- 1,3-diene gives a mixture of 1,2-monoepoxide and bridged 2,3 1,4-diepox-ide [IT] (equation 36). [Pg.333]

Telomerisation is an important, atom efficient reaction, which generates functionalised dienes from 1,3-diene feedstocks. The reaction, which typically employs a palladium based catalyst, comprises coupling two molecnles of a conjugated 1,3-diene... [Pg.118]

A new synthesis of substituted 1,3-dienes by reductive elimination of allylic nitro derivatives has been reported (Eq. 7.134).180 Tertiary allylic nitro compounds, bearing an acetate group in the (3-position, smoothly undergo reductive elimination to give conjugated 1,3-dienes when treated with chromous acetate and 2,2-dipyridine in DMF at 111-120 °C. [Pg.222]

Reactions of conjugated 1,3-dienes, mainly butadiene and isoprene, catalyzed by transition metal complexes to form a number of linear and cyclic oligomers and telomers, are one of the most fascinating fields of research in the last 20 years. Extensive studies from academic and in-... [Pg.141]

Similarly, < (170) of 34 is 8 ppm lower than that of 28. Accordingly, although the 1,3-diene system of 33 does not possess the nature and thermochemical stability of ordinary conjugated 1,3-dienes, substituent effects are transmitted at least as efficiently through this system as they are transmitted through the aromatic system of 34. [Pg.79]

III. NMR SPECTROSCOPIC CHARACTERIZATION AND FLUXIONAL BEHAVIOR A. Conjugated 1,3-Diene Complexes... [Pg.890]

Asatone (110 Scheme 25), a neolignan, was quickly assembled by capitalizing upon the ability of a nucleophilic solvent to intercept the intermediate cation formed upon the electrooxidation of (108) in this instance the conjugated 1,3-diene (109) was produced. This result contrasts with the oxidation of 4,5-dimethoxyphenol (101) (Scheme 23) wherein the nonconjugated 1,4-diene (102) was generated. Diene (109) served admirably as both the diene and the dienophile in an intermolecular Diels-Alder reaction leading to asatone (110) [51]. [Pg.329]

Typical rubbers are ungrafted low gel diene rubbers, or mixtures of diene rubbers. Such rubbers include copolymers and block copolymers of conjugated 1,3-dienes, substituted styrene monomers and other monomers as shown in Table 8.3. [Pg.213]

In hetero-Diels-Alder reactions, the effect of ligand structure and acidity on the catalytic activity of lanthanide catalysts has been reviewed.191 The effect of different C(2)-symmetric bisoxazolines on the zinc(II)-catalysed hetero-Diels-Alder reaction of ethyl glyoxylate with conjugated 1,3-dienes has been investigated.192 The hetero-Diels-Alder reaction 4-dimethylamino-2-phenyl-l-thiabuta-1,3 -diene with methyl acrylate and /V-cnoyloxazolidinone produces cw-3,4-disubstituted 3,4-dihydro-2//-... [Pg.451]

Early findings by Heck and co-workers [56] have shown that the palladium-catalyzed coupling of aromatic halides, non-conjugated 1,3 dienes and secondary amines gives the corresponding arylallylated amines. A representative example is given in Scheme 8.20. [Pg.235]

As was found for the polymerization of styrene, CpTiCT/M AO and similar half-sandwich titanocenes are active catalysts for the polymerization of conjugated 1,3 dienes (Table XX) (275). Butadiene, 1,3-pentadiene, 2-methyl-l,3-pentadiene, and 2,3-dimethylbutadiene yield polymers with different cis-1,4, trans-1,4, and 1,2 structures, depending on the polymerization temperature. A change in the stereospecificity as a function of polymerization temperature was observed by Ricci et al. (276). At 20°C, polypen-tadiene with mainly ds-1,4 structures was obtained, whereas at -20°C a crystalline, 1,2- syndiotactic polymer was produced. This temperature effect is attributed to a change in the mode of coordination of the monomer to the metallocene, which is mainly cis-rf at 20°C and trans-rj2 at -20°C. [Pg.149]

Functionalized dienes can be obtained by C-C bond formation between 1,3-dienes and alkenes via oxidative coupling with electron-rich ruthenium catalysts but also via insertion into Ru-H and then Ru-C bonds. For example, Ru(COD)(COT) catalyzed the selective codimerization of 1,3-dienes with acrylic compounds to give 3,5-dienoic acid derivatives [18] (Eq. 13). -coordination of 1,3-diene to a hydridoruthenium leads to a 7r-allylruthenium species to selectively give, after coupling with the C=C bond and isomerization, the functionalized conjugated 1,3-dienes. [Pg.7]

A 7r-allylruthenium complex, formed from 1,3-diene and a preformed Ru-H complex, was also postulated to be an intermediate for the regioselective hy-drovinylation of unsymmetrically substituted 1,3-dienes to afford 3-methyl-1,4-dienes as products [19] (Eq. 14). Isomerization of the initially formed 1,4-diene, such as 33, to the stabler conjugated 1,3-diene did not occur. [Pg.7]

It was noted above that conjugated 1,3-dienes generally coordinate more effectively to transition metals than do a,co-dienes. This may be traced... [Pg.139]

As found for the polymerization of styrene, CpTiCl3/MAO and similar half-sandwich titanocenes are active catalysts for the polymerization of conjugated 1,3-dienes (Table 25) [218], Butadiene, 1,3-pentadiene, 2-methyl-l,3-pentadiene and 2,3-dimethylbutadiene yield polymers with different... [Pg.180]

The photo-cycloaddition of alkenes and dienes to styrenes and stilbenes has been recently reviewed by Lewis (1979). tranj-Stilbene adds to many electron-rich alkenes to give [2 + 2]-cycloaddition products (Kaupp et al., 1978). Similar products are formed with vinylene carbonate (Lewis and Hoyle, 1977). Conjugated 1,3-dienes give [2 + 2]-cycloaddition products (Lewis and Hoyle, 1977 Lewis and Johnson, 1977). When nonpolar solvents are used, the reaction is modestly regioselective, but as the polarity of the solvent is increased the selectivity increases. Since the dienes quench the fluorescence of the stilbenes, it appears that exciplexes are involved. [2 + 2]-Cycloaddition takes place when indene (Sket and Zupan, 1976) and imidazoles (Ito and Matsura, 1979) are irradiated in the presence of hexafluorobenzene and... [Pg.103]

Conjugated 1,3-dienes can coordinate to a single metal atom or may bridge two metals of the cluster. Most commonly the diene coordinates to a single metal atom in the cis conformation, as in (29). The diene is found in the s-trans conformation bridging two metals in Os3(CO)io(l,3-butadiene) (30). [Pg.3964]

A similar type of reaction has been observed in the reactions of iron-caibene complexes with 1,3-dienes. In this case the direction of reductive elimination in the metal hydride intermediate corresponding to (193) is constrained to that which generates a conjugated 1,3-diene however, two isomeric products are also obtained from this reaction which are epimers about the face of the diene to which the iron tricarbonyl group is attached. This reaction produces highly functionalized 1,3-dienyl complexes of iron in high yield under relatively mild conditions and will likely play a role in the development of the... [Pg.1088]

Overreduction may occur as a consequence of initial protonation at the terminal atoms of the cy-clopentadienyl anions to form the conjugated 1,3-dienes (5) or (16), which are then vulnerable to further reduction, affording tetrahydro products, e.g. (8), (20) or (21). These products can also be formed when the reaction medium is sufficiently basic to catalyze conjugation of the 1,4-dienes to the 1,3-isomers. The alcohol may then serve an important additional role by functioning as a buffer (c/. Section 3.4.3.6, however). [Pg.491]


See other pages where Conjugate 1,3 dienes is mentioned: [Pg.44]    [Pg.14]    [Pg.336]    [Pg.340]    [Pg.355]    [Pg.586]    [Pg.9]    [Pg.14]    [Pg.62]    [Pg.892]    [Pg.93]    [Pg.546]    [Pg.885]    [Pg.58]    [Pg.264]    [Pg.44]    [Pg.165]    [Pg.563]    [Pg.565]    [Pg.451]    [Pg.12]    [Pg.112]    [Pg.125]    [Pg.105]    [Pg.11]    [Pg.272]    [Pg.759]   
See also in sourсe #XX -- [ Pg.8 ]

See also in sourсe #XX -- [ Pg.8 ]




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1,3-Diene, conjugated

1,3-Diene, conjugated

Addition of Amines to Conjugated Dienes

Addition of Hydrogen Halides to Conjugated Dienes

Addition reactions diene conjugation

Addition reactions of conjugated dienes

Addition reactions to conjugated dienes

Addition reactions, of conjugated diene

Addition to a Conjugated Diene

Alkene conjugated diene

Alkynes, conjugated dienes

Alkynes, conjugated dienes hydrometalation

Allenes diene conjugation

Allyl carbonates conjugated diene preparation

Allylic compounds conjugated diene preparation

Aziridination of Conjugated Dienes

Baseline diene conjugation

Bonding conjugated dienes

Bonding in conjugated dienes

Bromination conjugated dienes

Bromination of conjugated dienes

Carbocations conjugated dienes

Carbometallation conjugated dienes

Carbon Conjugated-dienes

Carbon number conjugated dienes

Carbon-oxygen bonds diene conjugation, allylic intermediates

Carboxylation of conjugated dienes

Catalyzed Hydrogenation of Alkynes and Conjugated Dienes

Chlorine to conjugated dienes

Classes of Dienes Conjugated and Otherwise

Cobalt conjugated dienes

Cobalt, hydrogenation conjugated dienes

Complexes Derived from Conjugated Dienes

Conjugate addition Conjugated dienes

Conjugate addition dienes

Conjugated Diene Monomers

Conjugated Diene Systems

Conjugated Dienes and Ultraviolet Light

Conjugated Dienes and Ultraviolet Spectroscopy

Conjugated Dienes. Electrophilic and Radical Addition

Conjugated acyclic dienes

Conjugated diene 1,2-addition reactions

Conjugated diene Diels-Alder reactions

Conjugated diene allylic carbocations from

Conjugated diene bond lengths

Conjugated diene butyl

Conjugated diene complexes

Conjugated diene complexes 13C NMR spectra

Conjugated diene complexes Diels-Alder reactions

Conjugated diene complexes H NMR spectra

Conjugated diene complexes NMR chemical shifts for

Conjugated diene complexes NMR spectra of, in solution

Conjugated diene complexes Z-isomerization

Conjugated diene complexes acyclic

Conjugated diene complexes cis/trans interconversion

Conjugated diene complexes crystal structure

Conjugated diene complexes cyclic

Conjugated diene complexes cycloaddition

Conjugated diene complexes decomplexation

Conjugated diene complexes deprotonation

Conjugated diene complexes dimerization

Conjugated diene complexes electrocyclic ring closure

Conjugated diene complexes electrophilic additions

Conjugated diene complexes epoxidation

Conjugated diene complexes fluxional behaviour

Conjugated diene complexes halogenation

Conjugated diene complexes hydroacylation of, ruthenium-catalysed

Conjugated diene complexes hydrocyanation

Conjugated diene complexes hydrogenation

Conjugated diene complexes in stereoselective synthesis

Conjugated diene complexes insertion reactions

Conjugated diene complexes isomerization

Conjugated diene complexes nucleophilic additions

Conjugated diene complexes of Cr, Mo and

Conjugated diene complexes of Mn and

Conjugated diene complexes of Nb and

Conjugated diene complexes of Rh and

Conjugated diene complexes of Ru and

Conjugated diene complexes of Ti, Zr and

Conjugated diene complexes of bromine

Conjugated diene complexes of carbenium ions

Conjugated diene complexes of carboxylic acids

Conjugated diene complexes of chlorine

Conjugated diene complexes of fluorine

Conjugated diene complexes of halogen azides

Conjugated diene complexes of hydrochloric acid

Conjugated diene complexes of hydrogen nucleophiles

Conjugated diene complexes of hydrogen sulphide

Conjugated diene complexes of iodine

Conjugated diene complexes of mercury compounds

Conjugated diene complexes of nitrogen nucleophiles

Conjugated diene complexes of oxygen nucleophiles

Conjugated diene complexes of selenenyl compounds

Conjugated diene complexes of selenium nucleophiles

Conjugated diene complexes of sulphenyl compounds

Conjugated diene complexes of sulphur nucleophiles

Conjugated diene complexes oxidation

Conjugated diene complexes phenylsulphonylmercuration

Conjugated diene complexes photopericyclic reactions

Conjugated diene complexes protonation

Conjugated diene complexes reactions with carbon electrophiles

Conjugated diene complexes rearrangement

Conjugated diene complexes reduction

Conjugated diene complexes synthesis

Conjugated diene complexes synthesis/isomerization

Conjugated diene electrocyclic reactions

Conjugated diene electrophilic addition reactions

Conjugated diene electrostatic potential map

Conjugated diene heats of hydrogenation

Conjugated diene hydrogenation

Conjugated diene insertion reactions

Conjugated diene molecular orbitals

Conjugated diene polymerisation

Conjugated diene polymerisation monomer coordination

Conjugated diene polymers

Conjugated diene reaction with

Conjugated diene reaction with HBr

Conjugated diene stability

Conjugated diene synthesis

Conjugated diene system, type

Conjugated diene, 1,2-addition

Conjugated diene, 1,2-addition allylic carbocations from

Conjugated diene, 1,2-addition electrocyclic reactions

Conjugated diene, 1,2-addition molecular orbitals

Conjugated diene, 1,2-addition polymers

Conjugated diene, 1,2-addition reaction with

Conjugated diene, 1,2-addition stability

Conjugated diene, 1,2-addition synthesis

Conjugated dienes , measurement

Conjugated dienes , measurement Lipid stability measurements

Conjugated dienes 1,4-elimination

Conjugated dienes 4+4]photocycloaddition

Conjugated dienes Cope rearrangement

Conjugated dienes Subject

Conjugated dienes activation

Conjugated dienes addition reactions

Conjugated dienes anodic oxidation

Conjugated dienes bond lengths

Conjugated dienes butadiene

Conjugated dienes catalysts

Conjugated dienes chirality

Conjugated dienes chromium-catalyzed

Conjugated dienes conformation

Conjugated dienes coordination polymerisation

Conjugated dienes copolymerisation

Conjugated dienes coupling reactions

Conjugated dienes cyclic

Conjugated dienes cyclic, selective hydrogenation

Conjugated dienes cyclization

Conjugated dienes cycloaddition

Conjugated dienes defined

Conjugated dienes definition

Conjugated dienes difunctionalization

Conjugated dienes electrophilic

Conjugated dienes electrophilic additions

Conjugated dienes electrophilic attack

Conjugated dienes epoxidation

Conjugated dienes from alkynes

Conjugated dienes from allenes

Conjugated dienes from arenes

Conjugated dienes from cyclopropanes

Conjugated dienes from heterocycles

Conjugated dienes halogenation

Conjugated dienes heteroannular

Conjugated dienes homoannular

Conjugated dienes hydrogenation

Conjugated dienes hydrogenolysis

Conjugated dienes hydrozirconation

Conjugated dienes insertion reactions

Conjugated dienes interesting examples

Conjugated dienes interesting/important

Conjugated dienes linear

Conjugated dienes metallation

Conjugated dienes metathesis

Conjugated dienes molecular orbitals

Conjugated dienes numbering carbon atoms

Conjugated dienes olefins

Conjugated dienes oligomerization

Conjugated dienes overview

Conjugated dienes oxidation

Conjugated dienes oxidative

Conjugated dienes oxygenations

Conjugated dienes palladium-catalysed

Conjugated dienes palladium-catalyzed

Conjugated dienes photochemical

Conjugated dienes photodimerization

Conjugated dienes polymerisation mechanism

Conjugated dienes preparation

Conjugated dienes product

Conjugated dienes radical addition

Conjugated dienes reactivity

Conjugated dienes rearrangement

Conjugated dienes reductive

Conjugated dienes regioselectivity

Conjugated dienes resonance forms

Conjugated dienes rhodium-catalyzed

Conjugated dienes selective

Conjugated dienes sigmatropic shifts

Conjugated dienes stereoisomers

Conjugated dienes structure

Conjugated dienes synthesis

Conjugated dienes telomerization

Conjugated dienes thermochemistry

Conjugated dienes value , secondary

Conjugated dienes value , secondary oxidation products

Conjugated dienes with singlet oxygen

Conjugated dienes, additions

Conjugated dienes, alkenes

Conjugated dienes, characteristic reaction

Conjugated dienes, determination

Conjugated dienes, formation

Conjugated dienes, hydrosilylation

Conjugated dienes, reaction

Conjugated dienes, reaction with borane

Conjugated dienes, stability

Conjugated systems 1,3-dienes

Conjugation Dienes, conjugated)

Conjugation Dienes, conjugated)

Conjugation, Resonance, and Dienes

Coordination polymerization conjugated dienes

Cross-conjugated diene

Cross-coupling reactions 1-alkenylboron. conjugated diene synthesis

Cross-coupling reactions conjugated diene synthesis

Cycloaddition of conjugated dienes

Cycloaddition reactions conjugated dienes

Cycloaddition to Conjugated Dienes The Diels-Alder Reaction

Cycloaddition to conjugated dienes

Cycloolefin/conjugated diene

Cyclopolymerization of conjugated dienes

Diels-Alder reaction conjugated dienes

Diels-Alder reactions conjugated diene synthesis

Diene conjugates

Diene non-conjugated

Dienes and the Allyl System 2p Orbitals in Conjugation

Dienes conjugated

Dienes conjugated

Dienes conjugated polymerization

Dienes conjugated, hydroamination

Dienes cross-conjugated—

Dienes non-conjugated—

Dienes, conjugated Friedel-Crafts reaction

Dienes, conjugated acylation

Dienes, conjugated metal atoms

Dienes, conjugated reaction with

Dienes, hydroformylation conjugated

Difunctionalization of Conjugated Dienes

Dioxygenation conjugated dienes

Dissolving metals conjugated dienes

Double bond number, conjugated dienes

Electrocyclic Reactions of Conjugated Dienes and Trienes

Electrocyclizations diene-conjugated ylides

Electron delocalization conjugated dienes

Electron delocalization in conjugated dienes

Electrophilic Additions to Conjugated Dienes Allylic Carbocations

Electrophilic Additions to Conjugated Dienes Allylic arbocations

Electrophilic Attack on Conjugated Dienes 1,4 Addition

Electrophilic Attack on Conjugated Dienes Kinetic and Thermodynamic Control

Electrophilic addition reactions of conjugated dienes

Electrophilic addition to conjugated dienes

Electrophilic attack on conjugated dienes

Elimination to Form Conjugated Dienes

Enantioselectivity conjugated diene reactions

Enchainment conjugated dienes

Endoperoxides from conjugated dienes

Epoxidation conjugated diene

Epoxidation of conjugated dienes

Ethylene-propylene, conjugated diene rubber

Ethylene/propylene/non-conjugated diene

Fatty acids conjugated dienes value

G Polyfluorinated conjugated dienes

Grignard reagents conjugated dienes

Heteroannular conjugated diene

Heteroatomic nucleophiles diene conjugation

Homoannular conjugated diene

Homopolymers of Conjugated Dienes

Hydroamination of conjugated dienes

Hydrocarboxylation conjugated dienes

Hydroformylation of conjugated dienes

Hydrogen availability selective, conjugated dienes

Hydrogen bromide conjugated dienes

Hydrogen bromide to conjugated dienes

Hydrogen chloride conjugated dienes

Hydrogen chloride to conjugated dienes

Hydrogen halides conjugated dienes

Hydrogen halides to conjugated dienes

Hydrogen-bonding additives in conjugated dienes

Hydrogenation of conjugated dienes

Hydromagnesiation conjugated dienes

Hydromagnesiation of Conjugated Dienes

Hydrometallation conjugated dienes

Hydrosilylation of conjugated dienes

INDEX conjugated dienes

Irradiation conjugated diene complexes

Isomerization conjugated dienes

Ketones conjugated diene synthesis

Key Concepts—Conjugation, Resonance, and Dienes

Kinetic control conjugated dienes

Kinetic control to conjugated dienes

Lactones conjugated dienes

Linoleic acid conjugated dienes value

Lipid hydroperoxides conjugated dienes value

Mechanism conjugated diene hydrogenation

Mechanism conjugated dienes

Metal conjugated dienes

Metallacycles conjugated dienes

Molecular mechanics conjugated diene polymerization

Molecular orbital conjugated diene

Nickel conjugated diene synthesis

Nuclear Overhauser enhancement spectroscopy of conjugated dienes

Nuclear magnetic resonance spectroscopy of conjugated diene complexes

Nuclear magnetic resonance spectroscopy of conjugated dienes

Nucleophilic reactions conjugated dienes

Nucleophilic substitution diene conjugation, allylic intermediates

Of conjugated dienes

Olefins double-bonded diene conjugation

Oxidation of conjugated dienes

Oxidative addition diene conjugation

Oxidative coupling conjugated dienes

Palladium catalysts conjugated dienes

Palladium complexes diene conjugation, allylic intermediates

Palladium conjugated diene synthesis

Palladium-catalysed reactions conjugated dienes

Palladium-catalyzed 1,4-additions conjugated dienes

Palladium-catalyzed 1,4-additions to conjugated dienes

Partition number, conjugated dienes

Photochemical cycloaddition conjugated dienes

Photochemistry of Conjugated Dienes and Trienes (Srinivasan)

Photopericyclic reactions of conjugated dienes

Polymerization Reactions of Conjugated Dienes

Polymerization of Conjugated Dienes Rubber

Preparation of Conjugated Dienes by 1,4-Elimination

Preparation of conjugated dienes

Radical addition of HBr to conjugated dienes

Reactions of Conjugated Dienes

Reduction of conjugated dienes

Regioselectivity conjugated diene reactions

Regioselectivity conjugated diene synthesis

Resonance conjugated dienes

Resonance energy conjugated dienes

Rhodium catalysts conjugated dienes

Rhodium-Catalyzed Hydrogenation of Alkynes and Conjugated Dienes

Ring structure diene-conjugated compounds

Rotational energy barrier conjugated dienes

Rubber, conjugated diene

Rubbers conjugated diene-based

Stability of Conjugated Dienes Molecular Orbital Theory

Stability of conjugated dienes

Stereochemistry conjugated diene hydrogenation

Stereochemistry conjugated dienes

Stereoisomerism of Conjugated Diene Polymers

Stereospecific polymerizations conjugated diene

Steric Control in Polymerizations of Conjugated Dienes

Studies with Conjugated Dienes

Substituted Acyclic Conjugated Dienes

Syndiotactic structures conjugated dienes

Synthesis of Conjugated (, )-Dienes

Synthesis of Conjugated (Z, )-Dienes

Synthesis of y-Lactams from Conjugated Diene-Magnesium Reagents

The Diels-Alder Reaction of Conjugated Dienes

The Stability of Conjugated Dienes

Transmetallation conjugated diene reactions

Two Neighboring Double Bonds Conjugated Dienes

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