Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Nitro-derivative

Nitro derivatives. No general experimental details for the preparation of nitro derivatives can be given, as the ease of nitration and the product formed frequently depend upon the exact experimental conditions. Moreover, some organic compounds react violently so that nitrations should always be conducted on a small scale. The derivatives already described are usually more satisfactory for this reason the nitro derivatives have been omitted from Table IV,9. [Pg.520]

Nitroamlines. Acetyl derivatives (p. 388), Benzoyl derivatives (p. 388). Diamines. Diacet> l derivatives (p. 388), Dibenzoyl derivatives (p. 388). Halogeno-hydrocarbons, a-Naphthyl ethers (from reactive halogen compounds, p. 391, and their Picratcs, p. 394), Nitro-derivatives (p.39i). Carboxylic acid (if oxidisable side chain) (p. 393). [Pg.403]

Upon nitration of phthalazines a nitro group is introduced only into the carbocyclic ring. Side reactions occur frequently. For example, nitration of phthalazine or its 1-methyl analog with potassium nitrate in concentrated sulfuric acid gives the 5-nitro derivative (100) as the main product together with 5-nitrophthalazin-l(2H)-one (101) as a by-producf (Scheme 27). [Pg.22]

Dimethylpyridazine 1,2-dioxide gives the 4-nitro derivative in good yield with nitric acid, while with benzoyl nitrate the yield is considerably lower. [Pg.21]

Nitration of benzo[6]thiophene (HNOs/AcOH) yields mainly the 3-nitro derivative. Under these conditions the /3 to a ratio of substitution is approximately 5 1, which is [Pg.49]

Fif rea given before the M.ps. of Nitro derivatives indicate position of nitro groups. [Pg.558]

However, prior protective acetylation of the amino group leads to a good yield of the 5-nitro compound [2-acetamido-4-methyl-5-nitroselenazole, m.p. 185 C (19)j. Similarly. 2-diethylamino-4-methy)-selenazole with nitric acid gives the. 5-nitro derivative [vellow needles, m.p. 93°C (26)], [Pg.243]

Nitration of aromatic amines with urea nitrate in sulfuric acid is reported to yield the -nitro derivative exclusively (44). When the para position is blocked, the meta product is obtained in excellent yield. [Pg.231]

Pyrazoles can undergo nitration at several positions 4-bromo-l-methylpyrazole yields the 3,5-dinitro product. 1-Methylpyrazole 2-oxide yields the 5-nitro derivative. [Pg.57]

Cinnolin-4(lF/)-one and its 6-chloro, 6-bromo, 6-nitro and 8-nitro derivatives react with sulfuryl chloride or bromine in acetic acid to give the corresponding 3-halo derivatives in about 20% yields. lodination of 8-hydroxycinnolin-4(lF/)-one with a mixture of potassium iodide and potassium iodate gives the 5,7-diiodo derivative the 6,8-diiodo derivative is formed from 5-hydroxycinnolin-4(lF/)-one. [Pg.21]

Oxidation of side chains. Aromatic nitro compounds that contain a side chain (e.g., nitro derivatives of alkyl benzenes) may be oxidised to the corresponding acids either by alkahne potassium permanganate (Section IV,9, 6) or, preferably, with a sodium dichromate - sulphuric acid mixture in which medium the nitro compound is more soluble. [Pg.529]

Nitration of cinnoline 2-oxide takes a different course. With nitric and sulfuric acids or with potassium nitrate and sulfuric acid a mixture of 8-nitrocinnoline 2-oxide, 6-nitrocinno-line 2-oxide and 5-nitrocinnoline 2-oxide is obtained, while with benzoyl nitrate in chloroform only a low yield (1.5%) of the 5-nitro derivative is obtained. [Pg.22]

The 2-benzamido 4-aryl(alkyl)selenazoles (96) form the corresponding 5-nitro derivatives under mild conditions using the nitrate-sulfuric acid method (Scheme 31). The nitro compounds are well-defined, ciy s-talline compounds. They may be most favorably obtained by dissolving the 2-benzamidoselenazoles in acetone and adding concentrated nitric [Pg.241]

Bromobenzene, iodobenzene and benzyl chloride behave somewhat similarly. The />-nitro-derivatives of the first two compounds frequently crystallise out even before pouring into water p-nitrobenzyl chloride usually remains as an oil for several minutes before solidifying. [Pg.391]

Also present but not essential in permanent hair colorants are nitro dyes which dye hair without oxidation. These dyes, nitro derivatives of aminophenols and benzenediamines, impart yellow, orange, or red tones. Although they have good tinctorial value, they are not as colorfast as the oxidative dyes. They also are used in semipermanent hair colorants. [Pg.457]

Hydroxyaminopyridazine 1-oxides are usually formed by catalytic hydrogenation of the corresponding nitro derivatives over palladium-charcoal in methanol, provided that the reaction is stopped after absorption of two moles of hydrogen. 3-Hydroxyaminopyridazine 1-oxide and 6-amino-4-hydroxyamino-3-methoxypyridazine 1-oxide are prepared in this way, while 5-hydroxyamino-3-methylpyridazine 2-oxide and 5-hydroxyamino-6-methoxy-3-methylpyridazine 2-oxide are obtained by chemical reduction of the corresponding nitro compounds with phenylhydrazine. [Pg.34]

Naphihalene-2-sulphonic acid crystallizes with 3H2O, m.p. 83 C. It is also used for the preparation of nitro-derivatives. [Pg.269]

Nitro and Nitroso Dyes. These dyes are now of only minor commercial importance, but are of interest for their smaU molecular stmctures. The early nitro dyes were acid dyes used for dyeing the natural animal fibers such as wool and sUk. They were nitro derivatives of phenols, eg, picric acid [88-89-1] (73) (Cl 10305), or naphthols, eg. Cl Acid YeUow 1 [846-70-8] (74) (Cl 10316). [Pg.284]

Amino-4-nitropheno1 is produced commercially by the partial reduction of 2,4-dinitrophenol This reduction may be achieved electrolyticaHy using vanadium (159) or chemically with polysulftde, sodium hydrosulftde, or hydrazine and copper (160). Alternatively, 2-acetamidophenol or 2-methylbenzoxazole may be nitrated in sulfuric acid to yield a mixture of 4- and 5-nitro derivatives that are then separated and hydrolyzed with sodium hydroxide (161). [Pg.313]

Although this reduction is more expensive than the Bnchamp reduction, it is used to manufacture aromatic amines which are too sensitive to be made by other methods. Such processes are used extensively where selectivity is required such as in the preparation of nitro amines from dinitro compounds, the reduction of nitrophenol and nitroanthraquinones, and the preparation of aminoazo compounds from the corresponding nitro derivatives. Amines are also formed under the conditions of the Zinin reduction from aromatic nitroso and azo compounds. [Pg.262]


See other pages where Nitro-derivative is mentioned: [Pg.281]    [Pg.281]    [Pg.101]    [Pg.102]    [Pg.201]    [Pg.73]    [Pg.241]    [Pg.577]    [Pg.16]    [Pg.20]    [Pg.21]    [Pg.21]    [Pg.69]    [Pg.76]    [Pg.77]    [Pg.78]    [Pg.79]    [Pg.100]    [Pg.130]    [Pg.163]    [Pg.173]    [Pg.177]    [Pg.229]    [Pg.49]    [Pg.49]    [Pg.70]    [Pg.85]    [Pg.91]    [Pg.203]   
See also in sourсe #XX -- [ Pg.49 ]

See also in sourсe #XX -- [ Pg.49 ]

See also in sourсe #XX -- [ Pg.261 , Pg.265 ]

See also in sourсe #XX -- [ Pg.183 ]

See also in sourсe #XX -- [ Pg.157 ]

See also in sourсe #XX -- [ Pg.49 ]

See also in sourсe #XX -- [ Pg.19 ]

See also in sourсe #XX -- [ Pg.128 , Pg.166 ]

See also in sourсe #XX -- [ Pg.6 , Pg.7 , Pg.7 , Pg.29 , Pg.48 , Pg.50 ]




SEARCH



4-Diazo-l-oxide nitro derivatives

5-Membered rings nitro derivatives, reactions

5-nitro-2-furyl derivatives

A -Nitro derivative, to protect amines

Acetylenes, nitro derivatives

Alizarine, Nitro Derivatives

Alizarine, Nitro Derivatives Dihydroxyanthraquinone

Amine derivatives, from aromatic nitro compounds

Analytical Procedures for Benzene, Nitro Derivatives

Anthragallol, Nitro Derivatives

Anthragallol, Nitro Derivatives Trihydroxy anthraquinones

Anthraquinone nitro derivatives

Aromatic C-nitro compounds derivatives

Aromatic hydrocarbons nitro derivatives

Aromatic nitro-derivatives

Benzene derivatives nitro groups

Benzene, Nitro Derivatives

Benzidine, nitro derivatives

Benzofurazan, nitro derivatives

Benzofuroxans, nitro derivatives

Benzotriazoles, nitro derivatives

Deoxy derivatives C-nitro compounds

Derivatives from P-Nitro Alcohols

Furoxans, nitro derivatives

Guanidine nitro derivatives

Hydrocarbon derivatives nitros

Hydroxy-, derivatives N-nitro-, reactions

Imidazoles, nitro derivatives

Isoxazole, Amino-Diazo-and Nitro-Derivatives

Malonaldehyde, nitro-, sodium derivative

N-Containing nitro-derivatives, most

N-nitro derivatives

NITRO DERIVATIVES OF BENZENE Nitrobenzene

Nitro Substituted Derivatives

Nitro and nitroso derivatives

Nitro compds., aliphatic 1,1 -nitroethylene derivs

Nitro compds., aliphatic ethylene derivs

Nitro compounds 1.1- nitroethylene derivative

Nitro compounds derivatives

Nitro compounds, thiophene derivatives

Nitro derivatives of aminophenols

Nitro derivatives of aromatic hydrocarbons

Nitro derivatives of azoxybenzene

Nitro derivatives of benzene

Nitro derivatives of carbazole

Nitro derivatives of cresol

Nitro derivatives of diphenyl

Nitro derivatives of ethylbenzene

Nitro derivatives of mesitylene

Nitro derivatives of phenothiazine

Nitro derivatives of polymers

Nitro group in aryl ring, derivation

Nitro nitrobenzenes and derivatives

Nitro-amines acyl derivatives

Nitro-derivatives of Hydrocarbons

Nitro-derivatives of abietic acid

Nitro-derivatives of lignin

Nitro-derivatives of toluene

Nitro-derivatives, PAH

P- Xylene nitro derivatives

Phenols, nitro derivatives

Primary amines N-nitro derivatives

Pyrazoles, nitro derivatives

Pyrrole, nitro derivatives

Quinone, nitro and other derivs of,

Reductive of nitro derivatives

Sensitivities of Heterocyclic Nitro Derivatives

Thiophen, 2- nitro derivatives

Tjipanazole synthesis from nitro derivative

Toluene nitro derivatives

Urethan, nitro-, and ammonium derivative

© 2019 chempedia.info