Oxidation oxime

In contrast with the Schiff base salen, salicylaldehyde oxime (79) (salox) complexes of Co have received comparatively little attention, but a series of bis-bidentate divalent complexes of the form iraiis-Co(sa 1 ox)2( D M SO)2 have been reported.343 The heterocyclic bidentate oxime violurate (lH,3H-pyrimidine-2,4,5,6-tetrone 5-oximate, Hvi) (80) and its /V-methyl (mvi) and /V,/V -dimethyl (dmvi) derivatives form high-spin divalent [Co(vi)]+ and Co(vi)2 complexes, whereas [Co(vi)3] is low spin.344 The mixed-ligand Co(dmvi)2(phen) complex is also low spin. The crystal structure of m-Co(pxo)2Br2 (pxo = 2-acetylpyridine-l-oxide oxime) is isostructural with the Ni11 relative.345 The dichloro complex also adopts a cis configuration. The tridentate dioximes 2,6-diformyl-4-methylphenol dioxime and 2,6-diacetyl-4-methylphenol dioxime (Hdampo) form binuclear complexes of the type (81a) and (81b) respectively.346 Cobalt oxide nanoparticles were prepared by... 

The 1,4-addition of RMgX or RLi to nitroalkenes produces nitronate intermediates, which are converted into nitroalkanes, nitrile oxides (oxime chlorides), or carboxylic acids, depending on the conditions of hydrolysis (Scheme 4.14).94... 

Nitrosation of mesityl oxide oxime leads to the dioxide 96, correctly formulated by Freeman.119 Earlier workers had formulated the product as a nitrimine128 and as a nitrosonitrone.118 Hypobromite oxidation of 97 leads to the same compound129 (Scheme 35), whereas the 4-bromo analog of 96 has been prepared by base elimination of HBr from a dibromopyrazoline N,N -dioxide precursor.119... 

Other simple chelate ligands which have been found to give six-coordinate complexes NiX2L2 are 2-acetylpyridine N-oxide oxime,2495 2-acetamidopyridine,2496 pyridine-2-(acetic acid methyl ester)2497 and -substituted 2-aminopyridine N-oxides.2498... 

Nitrosonium ion can also act as a mild and selective oxidizing agent. It has been used to cleave oxidatively oximes, hydrazones,498 and thioketals to their corresponding carbonyl compounds,499 to cleave benzylic esters515 [Eq. (5.195)], and to oxidize O-tributylstannyl and (9-trimethylsilyl ethers and benzylic alcohols516 [Eq. (5.196)]. 

See Sulfinyl chloride 1,2,3-Cyclohexanetrione trioxime, etc. See other FURAZAN N-OXIDES, OXIMES... 

Nitrogen atoms of organic compounds form relatively strong hydrogen bond with OH group of a host compound and amines, amine X-oxides, oximes, and esters of amino acids can be resolved efficiently by complexation with a chiral host. Optical resolutions of these compounds are described. 

On the other hand, conjugated nitroalkenes are very useful electron-poor alkenes, prone to act as nucleophilic acceptor, mainly in the Michael reaction (Berestovitaskaya et al., 1994) or in the Diels-Alder cycloaddition (Denmark and Thorarensen, 1996). Moreover, the nitro group can be easily turned into a respectable array of functional groups such as its reduction to a primary amine, replacement with hydrogen (Ballini et al., 1983 Ono, 2001), conversion into a carbonyl (Nef reaction) (Ballini and Petrini, 2004), and transformation into other important functionalities such as nitrile, nitrile oxide, oximes, hydroxylamines, and thiols (Colvin et al., 1979). 

Lead tetraacetate oxidizes oximes to various products. For exanqrle, the oxime of cyclohexanone gives a-acetoxynitrosocyclohexane in 35% yield.Aldoximes react with lead tetraacetate to give nitrile oxides which then yield acetyl hydroxamates 1 reaction with acetic acid. ... 

An interesting reaction is that between 6-methyl-4-nitropyridazine 1-oxide or its 3-substituted analogs (115) and acetyl chloride. Along with the expected 4-chloro derivatives (116) other products were isolated and later identified as 3-substituted 4-chloro-6-formyl-pyridazine 1-oxide oximes (117). ... 

Reduction of nitro, A/-oxides, oximes, azides, nitriles and nitroso compounds... 

Emmons and Pagano [75] succeeded in oxidizing oximes of alicyclic ketones with trifluoro peracetic acid to yield nitrocyclopentan and nitrocyclohexane with the yield of 60-62%. Oximes of steroids were oxidized with nitric acid-hydrogen peroxide to yield gem-dinitro derivative which under hydrogenation on platinum gave nitrosteroids with the nitro group in positions 3,4,6, 7 and 17 176). 

Mere are Ihc main outlines for the conversion of oximes to nitro compounds. Emmons and Pagano [32) used peroxytrilluoroacetic acid to oxidize oximes to nitro compounds with a yield of up to 16%. The reaction is carried out in... 

This proces uses the same steps as the conventional process for manufacturing caprolactam from cyclohexane oxidation, oximation of cydododecanone, Beckmann rearrangement... 

Even though oxygen in small percentages catalyzes the reaction effectively, many other initiators have been disclosed, including peroxy compounds, ozonides, azo compounds, azines, amine oxides, oximes, hydrazines, and hypohalites. The pol3Tnerization reaction is highly exothermic and requires strict control and elaborate safety measures in order to prevent... 

Thallium(iii) nitrate in methanol rapidly and cleanly oxidizes oximes, semi-carbazones, or phenylhydrazones to give the corresponding aldehydes or... 

Amines, Amine N-Oxides, Oximes, and Amino Acid Esters... 

Oxidoethane a,p-Oxidoethane. See Ethylene oxide Oxime copper. See Copper 8-quinolinolate 2-Oximiminobutane. See Methyl ethyl ketoxime Oxine copper. See Copper 8-quinolinolate Oxirane. See Ethylene oxide... 

The rates of deoximation of oximes using cetyltrimethylammonium dichromate in the presence of acetic acid and a cationic surfactant is sensitive to the concentrations of aU four substances substituent effects are also reported. The oxidant preferentially oxidizes oxime over hydroxyl groups. 

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