What is common name of Phenylazo 2-naphthol?
Sudan I
Sudan I
PubChem CID | 13297 |
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Structure | Find Similar Structures |
Chemical Safety | Laboratory Chemical Safety Summary (LCSS) Datasheet |
Molecular Formula | C16H12N2O |
Synonyms | Sudan I 842-07-9 Solvent Yellow 14 1-Phenylazo-2-naphthol C.I. Solvent Yellow 14 More… |
What are the uses of phenyl azo β-naphthol?
Sudan I [1-(phenylazo)-2-hydroxynaphthalene, C.I. Solvent Yellow 14, CAS No: 842-07-9] is used as the compound employed in chemical industry and to color materials such as hydrocarbon solvents, oils, fats, waxes, plastics, printing inks, shoe and floor polishes and gasoline.
What reactions are involved in the synthesis of 1 Phenylazo 2-naphthol?
1-Phenylazo-2-naphthol-3,6-disulphonic acid (disodium salt) was synthesized by conventional diazotization with sodium nitrite in hydrochloric acid, followed by alkaline coupling (Giral and Rojahn 1956). Recrystallization was carried out from ethanol-water mixtures.
What is the Colour product of 1 Phenylazo 2-naphthol?
A red colour develops and crystals of crude phenylazo-β-naphthol separate out. Allow the reaction mixture to stand for 30-40 minutes with stirring to complete the reaction.
Is Para Red an azo dye?
Para Red (paranitraniline red, Pigment Red 1, C.I. 12070) is a dye. Chemically, it is similar to Sudan I. It was discovered in 1880 by von Gallois and Ullrich and was the first azo dye.
What is naphthol used for?
The compound 2-naphthol, or β-naphthol, is regarded as the most important chemical intermediate based on naphthalene. It is manufactured by fusing 2-naphthalenesulfonic acid with caustic soda and is converted into numerous dyes and dye intermediates, as well as into tanning agents, antioxidants, and antiseptics.
Is Sudan I water soluble?
Solubility : Soluble in water (0.5 g/l) at 30° C, DMSO, ethyl acetate, ethanol, ether, acetone, benzene, carbon disulfide, and carbon tetrachloride. Melting Point : 131-133° C (lit.)
Which dye is produced when 2-naphthol is replaced by phenol?
2-naphthol aniline dye
Further benzene diazonium chloride reacts with 2-naphthol forms a bright orange colour 2-naphthol aniline dye. Azo compounds are prepared by the reaction of diazonium salts with phenol under alkaline conditions.
Why are azo dyes coloured?
Azo dyes are coloured because they contain alternating single and double bonds, known as a conjugated system. This creates and areas of delocalisation above and below the plane of the molecule.
What is the common use for naphthalene?
Naphthalene is an aromatic hydrocarbon found in coal tar or crude oil. Naphthalene is used in the manufacture of plastics, resins, fuels, and dyes. It is also used as a fumigant insecticide that works by turning directly from a solid into a toxic vapor. This process is called sublimation.
Is naphthol and naphthalene same?
It is a white solid. It is an isomer of 2-naphthol differing by the location of the hydroxyl group on the naphthalene ring. The naphthols are naphthalene homologues of phenol, with the hydroxyl group being more reactive than in the phenols….1-Naphthol.
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Magnetic susceptibility (χ) | -98.2·10−6 cm3/mol |
What is the formula of azo?
Azo compounds are chemical compounds with the general formula R-N=N-R’, where R and R’ can be either aryl (aromatic) or alkyl (aliphatic) functional groups. The N=N group is called an azo group, although the parent compound, HNNH, is called diimide. The more stable azo compounds contain two aryl groups.
What is a Sudan food dye?
Sudan dyes are synthetic chemical dyes of similar chemical structure. They are aromatic compounds containing azo group ( – N=N – ). Sudan I, II, III and IV are kinds of the Sudan red dyes. They can be generally applied for colouring substances such as hydrocarbon solvents, oils, fats, waxes and plastics.
Is Sudan IV water soluble?
Solubility : Soluble in chloroform (66.67 mg/ml), water (0.7 mg/ml), ethanol (slightly), methanol, and acetone.
How azo dyes are formed?
Azo dyes are prepared by diazo coupling reaction. It is a reaction in which diazonium ions are coupled with rings of phenol or aromatic amines. It is an electrophilic aromatic substitution reaction in which diazonium ion acts as an electrophile while aromatic compounds act as nucleophiles.
What are azo dyes used for?
Azo dyes are the most important synthetic colorants which have been widely used in textile, printing, paper manufacturing, etc.
Is methyl orange an azo dye?
Methyl orange [(MO) dimethylaminoazobenzenesulfonate] is a common and typical azo anionic dye. This water-soluble organic synthetic dye has very high colorability and presents a bright orange color when dissolved in water.
Is methylene blue an azo dye?
Methylene Blue (MB) is an Azo dye with benzene rings, toxic and persistent in the environment.
Where is Para Red used?
General description. Para Red is a biological stain. It is used as a fat soluble chemical dye and food additive. It is a banned colorant and a number of analytical techniques have been developed to detect it in food.
What type of dye is Para Red?
A class of bright cherry-red synthetic organic colorants. Para red was first synthesized in 1880 by Holliday in England. The dye is made by reacting beta-naphthol with Paranitroaniline, a coal-tar derivative. Different shades are obtained by varying temperature and pH of the mixture.