Azoxy compounds


XXIII. Azoxy-compounds 558  [c.531]

Table XXIII. Azoxy compounds. Table XXIII. Azoxy compounds.
They are always coloured but give colourless products upon reduction. Hydrazo and azoxy compounds are reduced in acid solution to the parent amine.  [c.1074]

Azoxy Compounds (continued)  [c.1086]

XXIII. Azoxy-compounds 558  [c.533]

Table XXIII. Azoxy-compounds. Table XXIII. Azoxy-compounds.
Azoxy Compounds. Where the position of the azoxy oxygen atom is unknown or immaterial, the compound is named in accordance with azo rules, with the affix azo replaced by azoxy. When the position of the azoxy oxygen atom in an unsymmetrical compound is designated, a prefix NNO- or ONN- is used. When both the groups attached to the azoxy radical are cited in the name of the compound, the prefix NNO- specifies that the second of these two groups is attached directly  [c.28]

Alkoxyl tion. The nucleophilic replacement of an aromatic halogen atom by an alkoxy group is an important process, especially for production of methoxy-containing iatermediates. Alkoxylation is preferred to alkylation of the phenol wherever possible, and typically iavolves the iateraction of a chloro compound, activated by a nitro group, with the appropriate alcohol ia the presence of alkaU. Careful control of alkaU concentration and temperature are essential, and formation of by-product azoxy compounds is avoided by passiag air through the reaction mixture (21).  [c.293]

The synthesis of the azoxy compounds has seen significant progress in the past decade. As already noted, compounds of this type may be prepared by  [c.139]

Nitroso, Azo, Azoxy and Hydrazo Compounds, Table XI, 8,2.  [c.1083]

TABLE XI,8,2. NITROSO, AZO, AZOXY AND HYDRAZO COMPOUNDS  [c.1085]

TABLE XI,8,2. NITROSO, AZO, AZOXY AND HYDRAZO COMPOUNDS  [c.1086]

In catalytic hydrogenation, a compound is reduced with molecular hydrogen in the presence of a catalyst. This reaction has found appHcations in many areas of chemistry including the preparation of amines. Nitro, nitroso, hydroxylamino, azoxy, azo, and hydrazo compounds can all be reduced to amines by catalytic hydrogenation under the right conditions. Nitriles, amides, thioamides, and oximes can also be hydrogenated to give amines (1). Some examples of these reactions foUow  [c.257]

A great variety of solvents has been used with success. Reactive solvents, such as acetic anhydride, will react with the amine as formed. Basic solvents cause the formation of azo, azoxy. and hydrazo compounds, paralleling chemical reductions (39,73).  [c.105]

Haber based this mechanism on the electrochemical reduction of nitrobenzene, but it has siace been used by many researchers to explain the results of hydrogenation studies. For example, a mechanistic and kinetic study of the hydrogenation of nitrobenzene to aniline concluded that the reaction proceeds through a number of iatermediates including nitrosobenzene, phenyUiydroxylamiae, azoxybenzene, azobenzene, and hydrazobenzene, even though not all of these iatermediates were detected (3). Further evidence of the existence of these iatermediates is provided by reports that uader certaia coaditioas, catalytic hydrogeaatioa of nitro compounds can yield either hydroxylamines (4,5) or azoxy compounds (6) as the major product.  [c.258]

Hydrazines (39,46) and materials such as azines (ii) hydrazones, hy-drazides, and azo (17J20,I22J52,I65,I70) and azoxy compounds that form hydrazines on reduction undergo hydrogenolysis of the nitrogen-nitrogen bond. Usually the rate of reduction of each of these hydrazine precursors is sufficiently greater than the rate of hydrogenolysis so that the first step provides a good synthesis of the hydrazine. Azines and azides are cleaved to amines, providing a good route to various amino compounds.  [c.168]

It must be noted, however, that nitroso, azoxy and azo compounds when subjected to the same treatment yield res])ectively hydroxylamines, hydrazo and hydrazine compounds, all of which reduce ammoniacal silver nitrate solution in the cold.  [c.528]

It must be remembered, however, that nitroso, azoxy and azo compounds (which are usually more highly coloured than nitro compounds) may bo reduced by zinc powder to the corresponding hydroxylamino, hydrazo and hydrazine compounds respectively, all of which reduco Tollen s reagent in the cold.  [c.1074]

The strong electron-acceptor action of the nitro group in o-nitrotoluene confers increased reactivity on the methyl group thus the methyl group is easily oxidized. Oxidation with potassium permanganate or potassium dichromate causes the formation of o-nitrobenzoic acid [552-16-9]. When boiled with a sodium hydroxide solution, o-nitrotoluene exhibits the phenomena of autoxidation and reduction and yields anthraruhc acid. When the oxidation is carried out with manganese dioxide and sulfuric acid, o-nitrobenzoic acid or o-nitrobenzaldehyde [552-89-6] is formed, depending on the reaction conditions. One method of reducing o-nitrotoluene to (9-toluidine is by iron powder and hydrochloric acid. Alkaline reduction with iron or zinc leads in a stepwise fashion to azoxy, azo, and hydrazo compounds, depending on the reaction conditions. Nitration of o-nitrotoluene gives 2,5-dinitrotoluene [121 -14-2] and 2,6-dinitrotoluene [606-20-2]. Chlorination of o-nitrotoluene in the absence of iron yields o-nitrobenzyl chloride [612-23-7] o-chlorotoluene, or (9-chlorobenzyl chloride, depending on the reaction conditions. In the presence of iron, chlorination results in the formation of 2-nitro-6-chlorotoluene [83-42-1] and 2-nitro-4-chlorotoluene [89-59-8].  [c.69]

Nhro. Nitroso. Azo. Azoxy, Azido Compounds 403 359 437 273 30 317, 379,433 11 12.104 123, 210,27129t 360 U3, 226 423 341 432  [c.453]

Nitro-compounds yield a series of reduction products accordmgto the nature of the reducing agent. Alkaline reducing agents sodium methylate, zinc dust and caustic soda, stannous chloride and caustic soda, produce azoxy, azo- and hydiazo-compounds.  [c.274]


See pages that mention the term Azoxy compounds : [c.1085]    [c.1122]    [c.198]    [c.2]    [c.277]    [c.70]    [c.429]    [c.6]    [c.339]    [c.141]    [c.145]   
Textbook on organic chemistry (1974) -- [ c.1074 ]

Langes handbook of chemistry (1999) -- [ c.0 ]