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Oxidative nitriles

The as-spun acrylic fibers must be thermally stabilized in order to preserve the molecular structure generated as the fibers are drawn. This is typically performed in air at temperatures between 200 and 400°C [8]. Control of the heating rate is essential, since the stabilization reactions are highly exothermic. Therefore, the time required to adequately stabilize PAN fibers can be several hours, but will depend on the size of the fibers, as well as on the composition of the oxidizing atmosphere. Their are numerous reactions that occur during this stabilization process, including oxidation, nitrile cyclization, and saturated carbon bond dehydration [7]. A summary of several fimctional groups which appear in stabilized PAN fiber can be seen in Fig. 3. [Pg.122]

NITRILE OXIDES. Nitrile oxides are a well known class of compds represented by R.C N- 0, and are usually prepd by treating hydroxamic acid chlorides with a mild alkali, thus eliminating HQ (Ref 2). Wieland (Refs 1 3) was responsible for the first isolation of free nitrile oxides. These compds are somewhat unstable, showing a marked tendency to dimerize to (he corresponding furoxanes (1,3-dipolar addition) (Refs 2 3). The nitrile oxides add to a considerable number of carbenes, as benzonitrUe oxide (for example) to a large number of olefins in ether at 20° (Ref 3)... [Pg.288]

Diazoalkane" Nitrous oxide Nitrile imine Nitrile ylid Nitrile oxide ... [Pg.1060]

We have already mentioned the synthetic versatility of silyl thioketones249 which is confirmed because they react with 1,3-dipoles (nitrile oxides, nitrile imines and nitrile ylides) to give regiospecifically silyl thiaheterocycles462. Equation 135 illustrates the reaction between phenyl trimethylsilyl thioketone and diphenyl nitrihmine. [Pg.1449]

Sulfur gases, ammonia, nitrogen oxides, nitriles, nitroalkanes, xylenols, water in benzene... [Pg.44]

The intermolecular 1,3-dipolar cycloaddition route to bicyclic heterocycles has received considerable attention since 1983. Diazoalkanes, N-oxides, nitrile imines, and nitrile oxides have all been used as the 1,3-dipole component in the synthesis of these heterocycles. [Pg.133]

The concept of intramolecular 1,3-dipolar cycloaddition reaction has been extended to include azides, azomethine imines, nitrile oxides, nitrile imines and azomethine ylides. Such reactions are summarized in Table 1. [Pg.1007]

A-oxide to quinoline.Polymethylhydrosiloxane with Pd—C is also an effective reducing agent for amino oxides.Nitrile oxides (R—C=N" -0 ) can be... [Pg.1846]

Nitrile oxides Nitrile oxides have been used in conjunction with microwaves in fullerene chemistry. For example, the 3 -(N-phenylpyrazolyl)isoxazolino[60]-fullerene dyad 38a was prepared in 22% yield from the corresponding nitrile oxide (Scheme 21.15) [49]. Longer reaction times afforded larger amounts of bis adducts. The same reactions under thermal conditions produced markedly lower yields (14-17%). A significant accelerating effect (10 min compared with 24 h) was observed on using microwave irradiation. [Pg.941]

In oxidation processes heterogeneous catalysts are mainly used in gas-phase processes. In the oxidation of ethylene to ethylene oxide, supported silver catalysts are used in the other examples, reducible metal oxide catalysts are used. In amm-oxidation nitriles and HCN are obtained by using NH3/O2 mixtures. The oxy-chlorination of ethylene with HCI/O2 is used for the production of vinyl chloride. [Pg.262]

Far more interesting are the elimination sequences which lead to the generation of reactive heterocumulenes (ketenimines, carbodiimides, isocyanates, isothiocyanates) or 1,3-dipoles (nitrile oxides, nitrile imides, nitrile... [Pg.8]

Owing to their tendency to dimerize to furoxans (1,2,5-oxadiazole 2-oxides), nitrile oxides 5 are usually generated in situ, i.e., in the presence of suitable dipolarophiles such as alkenes, alkynes, etc., from stable precursors such as aldoximes 12 (X = H) or from primary nitroalkanes 13 (Scheme 2) [5,57-67]. Generation of nitrile oxides 5 from aldoximes 12 (X = H) involves either direct oxidation or halogenation of aldoximes 12 (X = H) to hydroximoyl halides 12 (X = Cl or Br) followed by dehydrohalogenation [5,57-67,79,80]. Alternatively, nitrile oxides 5 are conveniently generated via dehydration of primary nitroalkanes 13 [ 17,38,39,65,66,81-95]. This review covers the literature in the last 10-15 years pertaining to the chemistry of isoxazoHnes synthesized from primary nitroalkanes 13. [Pg.86]

Type II Because of the similar energy gap in either direction, HOMO of the dipole can interact with LUMO of the dipolarophiles or HOMO of the dipolarophile can interact with LUMO of the dipole. The situation is referred to as a HOMO—LUMO-controlled dipole or an ambiphilic dipole and includes nitrile imine, nitrone, carbonyl oxide, nitrile oxide, and azide. [Pg.249]

Dipolar Cycloadditions with Nitrile Oxides (Nitrile Oxide—Norbomene Click Chemistry)... [Pg.139]

Nitriles exhibit a carbon atom with three bonds to a heteroatom (nitrogen). As a result, the conversion of a nitrile into a carboxylic acid (or vice versa) is neither a reduction nor an oxidation. Nitriles are therefore considered to be carboxylic acid derivatives, and they wiU also be discussed in this chapter. [Pg.980]

Platinum and manganese catalysts are more active than palladium- and chromium-hased catalysts when oxidizing nitrile compounds. A Pt (HS) catalyst is more active than a manganese catalyst and Pt (LS) catalyst. The Pt high surface area catalyst reaches complete conversion at 225°C while the manganese catalyst does not reach complete conversion until 300°C. Because NOx formation is temperature dependent, the Pt high surface area catalyst can present an advantage. With this catalyst, NOx formation can be minimized because it can be operated at low temperature. [Pg.196]

Percolation through activated sludge filters, biological oxidation, nitrilication... [Pg.332]


See other pages where Oxidative nitriles is mentioned: [Pg.387]    [Pg.819]    [Pg.665]    [Pg.503]    [Pg.807]    [Pg.143]    [Pg.473]    [Pg.503]    [Pg.704]    [Pg.547]    [Pg.480]    [Pg.9]    [Pg.243]    [Pg.595]    [Pg.626]    [Pg.61]    [Pg.595]    [Pg.387]    [Pg.648]    [Pg.405]   
See also in sourсe #XX -- [ Pg.11 , Pg.12 ]




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1,3-Dipolar cycloadditions nitrile oxides + alkenes

1,3-dipolar cycloaddition aryl nitrile oxides

1,3-dipolar cycloaddition of nitrile oxide

1,3-dipolar cycloaddition reactions aliphatic nitrile oxides

1,3-dipolar cycloaddition reactions with nitrile oxides

1,4,2-Oxathiazoles nitrile oxides

1- Butene, 3-methoxyreaction with nitrile oxide

1.2.4- Oxadiazoles nitrile oxides

1.3- Dipolar cycloaddition reactions nitrile oxides

1.3- Dipoles nitrile oxides

2- Nitrosopyridine, reaction with nitrile oxides

4,5-dihydroisoxazole nitrile oxide

4- Dialkylamino but-3-en-2-one reaction with nitrile oxides

4-Dimethylaminopyridine , nitrile oxide

5- Benzoyloxy-2 -furanone, reaction with aryl nitrile oxides

5-Acetoxy-2 -furanone, formation reaction with aryl nitrile oxides

Achiral dipolarophiles, nitrile oxide cycloadditions

Acrylamides, nitrile oxide cycloadditions

Acrylates cycloaddition reactions with nitrile oxides

Addition of nitrile oxides

Aldehydes nitrile oxide intermolecular cycloadditions

Aldehydes nitrile oxide intramolecular cycloadditions

Aldehydes nitrile oxides

Aldoximes nitrile oxides from

Aldoximes oxidation, nitrile oxide generation

Aliphatic nitrile oxides

Alkenes 3+2] cycloaddition with nitrile oxide

Alkenes catalytic nitrile oxide reactions

Alkenes intramolecular reactions, nitrile oxides

Alkenes nitrile oxide cycloadditions

Alkenes nitrile oxides

Alkenes reaction with nitrile oxides

Alkynes reaction with nitrile oxides

Alkynes with nitrile oxide

Allylic alcohols nitrile oxide cycloadditions

Allylic ethers with nitrile oxides

Amines, oxidation to nitriles

Amino polyols, nitrile oxides

Applications of nitrile oxides

Aromaticity, nitrile oxide cycloadditions, dipolar

Aryl nitrile oxides

Aryl nitrile oxides, cycloaddition

Asymmetric reaction nitrile oxide addition

Asymmetric reactions nitrile oxide cycloadditions, diastereoselectivity

Asymmetric reactions nitrile oxides

Azirines nitrile oxides

Biotin nitrile oxide intramolecular cycloadditions

By cycloaddition of nitrile oxides

By the reaction of nitrile oxides

C-X-Y-Fragment (Nitrile Oxide on Solid Phase)

Carbohydrate alkenes, nitrile oxide

Carbohydrate alkenes, nitrile oxide cycloadditions

Carbohydrate derivatives, nitrile oxide

Carbohydrate derivatives, nitrile oxide cycloadditions

Carbonyl compounds nitrile oxide cycloadditions

Catalytic cycloadditions nitrile oxides

Chemoselectivity, nitrile oxide cycloadditions

Chiral auxiliaries, diastereoselectivity, asymmetric nitrile oxide cycloadditions

Compactin via nitrile oxide cyclization

Cyclization, radicals with nitrile oxides

Cycloaddition intramolecular nitrile oxide [INOC

Cycloaddition of nitrile oxides with alkenes

Cycloaddition reactions of nitrile oxides with alkenes

Cycloaddition with nitrile oxides

Cycloadditions Involving Nitrile Oxides

Cycloadditions of nitrile oxides

Diastereoselectivity nitrile oxide cycloadditions

Diisopropyl nitrile oxide cycloadditions, chiral

Diisopropyl nitrile oxides

Dipolar cycloadditions of nitrile oxides

Dipolar cycloadditions with nitrile oxides

Dipolar nitrile oxide-based

Dipolarophiles nitrile oxide cycloadditions

Dipole structures nitrile oxides

Electron-Deficient C2 Fragments (Cycloadditions Involving Azomethines, Nitrones, Nitrile Oxides, and Dienes)

Enantioselectivity nitrile oxide cycloadditions

Esters nitrile oxide cycloadditions

Ethers, vinyl reaction with nitrile oxides

External reagents nitrile oxides

Facial selectivity nitrile oxide cycloadditions

Five-membered rings nitrile oxide intramolecular cycloadditions

From nitrile oxides

Furans nitrile oxide intramolecular cycloadditions

Furoxans intramolecular nitrile oxide cycloadditions

Furoxans nitrile oxides

Furoxans thermolysis, nitrile oxide generation

Grignard reagents, nitrile oxide cycloadditions

Hydrogen bonding, nitrile oxide cycloadditions

Hydrogen peroxide nitriles, oxidation with

Hydrogenation of nitrile oxide cycloaddition product

Hydroxamic acid chlorides nitrile oxides from

Hydroximoyl halide, nitrile oxide generation

Hydroxy ketones, synthesis from nitrile oxides

Intermolecular cycloadditions achiral nitrile oxides/chiral olefins

Intermolecular cycloadditions achiral nitrile oxides/olefins

Intramolecular nitrile oxide cycloaddition

Intramolecular nitrile oxide cycloaddition reaction

Intramolecular nitrile oxide cycloaddition synthesis

Intramolecular nitrile oxide-olefin

Intramolecular nitrile oxide-olefin cycloaddition

Intramolecular reaction nitrile oxide cyclization

Isocyanates nitrile oxides

Isocyanates, addition from nitrile oxide

Isothiocyanates nitrile oxides

Isoxazole from nitrile oxides

Isoxazoles by a Consecutive 3CR of Acid Chlorides, Alkynes, and Nitrile Oxides

Isoxazoles from nitrile oxides

Isoxazoles, from alkenes and nitrile oxides cycloaddition

Isoxazoline compounds nitrile oxide cycloadditions

Isoxazolines synthesis via nitrile oxide cyclization

Kinetic data, nitrile oxide cycloadditions

Lactones nitrile oxide intramolecular cycloadditions

Lewis acids nitrile oxide cycloadditions

Macrocyclic compounds, nitrile oxide

Magnesium alkoxides, nitrile oxide

Maytansine synthesis via nitrile oxide cyclization

Mesityl nitrile oxide

Mesityl nitrile oxide, 1,3-dipolar cycloaddition

Nitrile /V-oxides

Nitrile AT-oxides

Nitrile Oxides Mukaiyama procedure

Nitrile Oxides acids

Nitrile Oxides and Nitriles

Nitrile Oxides from 1,2,4-oxadiazoles

Nitrile Oxides from furazans

Nitrile Oxides from furoxans

Nitrile Oxides from isoxazolines

Nitrile Oxides oxidative dehydrogenation

Nitrile Oxides, Imines, and Sulfides

Nitrile TV-oxides

Nitrile oxide addition

Nitrile oxide cyclization

Nitrile oxide cyclization intramolecular

Nitrile oxide cycloaddition

Nitrile oxide formation

Nitrile oxide precursor

Nitrile oxide, Benzo

Nitrile oxide, Carbamoyl

Nitrile oxide, Functionalized

Nitrile oxide, cycloaddition structure

Nitrile oxide, cycloaddition synthesis

Nitrile oxides

Nitrile oxides

Nitrile oxides 1,3-dipolar cycloadditions

Nitrile oxides 1,4,2,5-dioxadiazines

Nitrile oxides INOC reaction

Nitrile oxides achiral olefins, with chiral auxiliaries

Nitrile oxides aldol” reduction-hydrolysis

Nitrile oxides aldol” ring cleavage, intermediates

Nitrile oxides aldoximes

Nitrile oxides alkene chiral centeres

Nitrile oxides aminoalcohol ring cleavage

Nitrile oxides aryl-bridged

Nitrile oxides as 1,3-dipoles

Nitrile oxides catalytic reactions

Nitrile oxides chiral dipolarophiles

Nitrile oxides cyclizations

Nitrile oxides cycloadditions

Nitrile oxides defined

Nitrile oxides deoxygenation

Nitrile oxides diastereoselective

Nitrile oxides diastereoselectivity

Nitrile oxides dimerization

Nitrile oxides dipolar cycloaddition

Nitrile oxides dipole/dipolarophiles

Nitrile oxides double bonds

Nitrile oxides from 2 molecules)

Nitrile oxides from nitrolic acids

Nitrile oxides frontier orbitals

Nitrile oxides functional derivatives

Nitrile oxides furoxan thermolysis

Nitrile oxides industrial applications

Nitrile oxides intramolecular cycloadditions

Nitrile oxides isoxazoles

Nitrile oxides isoxazoline compounds

Nitrile oxides isoxazoline ring cleavage

Nitrile oxides isoxazoline synthesis

Nitrile oxides mechanism

Nitrile oxides mechanistic studies and calculations

Nitrile oxides natural products

Nitrile oxides nitromethyl compounds

Nitrile oxides olefin regioselectivity

Nitrile oxides oxide

Nitrile oxides polycyclic isoxazolines and furoxans

Nitrile oxides polyols

Nitrile oxides reduction

Nitrile oxides regioselectivity

Nitrile oxides relative reactivity

Nitrile oxides stereoselectivity

Nitrile oxides structural chemistry

Nitrile oxides synthesis applications

Nitrile oxides synthesis from

Nitrile oxides tandem reaction sequences

Nitrile oxides to olefins

Nitrile oxides tropones

Nitrile oxides with acrylates

Nitrile oxides, alkenyl

Nitrile oxides, alkenyl cyclization

Nitrile oxides, alkenyl intramolecular cycloaddition

Nitrile oxides, alkynyl

Nitrile oxides, chiral, diastereoselectivity

Nitrile oxides, cycloaddition reactions

Nitrile oxides, cycloaddition with electron-deficient dipolarophiles

Nitrile oxides, cycloaddition with from primary nitro compounds

Nitrile oxides, cycloaddition with furoxans

Nitrile oxides, cycloadditions with alkenes

Nitrile oxides, cycloadditions, furan

Nitrile oxides, cycloalkenyl

Nitrile oxides, dimerisation

Nitrile oxides, dipolar cycloaddition with

Nitrile oxides, furanylcyclization

Nitrile oxides, reaction with benzoquinones

Nitrile oxides, reactions

Nitriles N-oxides

Nitriles formation from nitrile oxides

Nitriles from nitrile oxides

Nitriles nitrile oxides

Nitriles nitrile oxides

Nitriles oxidation

Nitriles oxidative decyanation

Nitriles silver oxide

Nitriles via oxidative cleavage of alkenes

Nitriles, oxidative cleavage

Nitroalkanes nitrile oxide generation

Nitrones and nitrile oxides as 1,3-dipoles

Nitrones nitrile oxide intermolecular cycloadditions

Nitrones nitrile oxide intramolecular cycloadditions

Of nitrile oxides with alkenes

Of nitrile oxides with alkenes compounds

Olefins chiral nitrile oxides

Olefins nitrile oxide cycloadditions

Oxazolines => nitrile oxides

Oxidation of Amides, Hydrazides, and Nitriles

Oxidation of nitriles

Oxidation of nitriles and amines

Oxidation state nitriles)

Oxidative Addition of Nitriles

Oximes nitrile oxide intramolecular cycloadditions

Oximes reaction to form nitrile oxide

Paliclavine via nitrile oxide cyclization

Paraffins nitrile oxides from

Porphyrinic nitrile oxides

Reaction with nitrile oxides

Reactions of Nitrile Oxides

Regioselectivity nitrile oxide cycloadditions

Relative reactivity, nitrile oxide cycloadditions

Relative reactivity, nitrile oxide cycloadditions relativity

Sarkomycin via nitrile oxide cyclization

Sodium hypochlorite, nitrile oxide generation

Solvent effects, nitrile oxide cycloadditions

Stable nitrile oxides

Stereoselectivity nitrile oxide cycloadditions

Uracils reaction with nitrile oxides

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