naphthol


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naphthol

(năf`thôl), C10H7OH, either of two crystalline monohydric alcohols. The naphthols are position isomersisomer
, in chemistry, one of two or more compounds having the same molecular formula but different structures (arrangements of atoms in the molecule). Isomerism is the occurrence of such compounds. Isomerism was first recognized by J. J. Berzelius in 1827.
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, differing in the location of the hydroxyl grouphydroxyl group
, in chemistry, functional group that consists of an oxygen atom joined by a single bond to a hydrogen atom. An alcohol is formed when a hydroxyl group is joined by a single bond to an alkyl group or aryl group.
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, -OH, on the carbon skeleton of naphthalenenaphthalene
, colorless, crystalline, solid aromatic hydrocarbon with a pungent odor. It melts at 80°C;, boils at 218°C;, and sublimes upon heating. It is insoluble in water, somewhat soluble in ethanol, soluble in benzene, and very soluble in ether, chloroform, or carbon
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; α-naphthol is 1-hydroxynaphthalene and β-naphthol is 2-hydroxynaphthalene: The naphthols have a number of similar properties. They melt at 95°C; and 122°C; and boil at 279°C; and 285°C;, respectively; both are soluble in alcohol and ether and slightly soluble in hot water. One way in which they differ is the form of their crystals—α-naphthol crystallizes in prisms and β-naphthol in plates. The naphthols are prepared by reacting naphthalene with sulfuric acid and hydrolyzing the resultant sulfate ester by heating it with sodium hydroxide solution. Both naphthols exhibit antiseptic properties. They are used in the synthesis of certain azo dyes and antioxidantsantioxidant,
substance that prevents or slows the breakdown of another substance by oxygen. Synthetic and natural antioxidants are used to slow the deterioration of gasoline and rubber, and such antioxidants as vitamin C (ascorbic acid), butylated hydroxytoluene (BHT), and
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 for rubbers. Naphthol solutions are used in chemical analysis to detect the ferric ion; dissolved ferric ion turns an α-naphthol solution violet and turns a β-naphthol solution green.
References in periodicals archive ?
Types of pigments: Blacks (spinel), Blues (spinel, phthaocyanine, indanthrone), Corrosion Inhibiting (zinc phosphate, modified zinc phosphate, zinc-free anticorrosives, organic inhibitor), Greens (spinel, phthaocyanine), Reds (naphthol, quinacridone, DPP, benzimidazolone), Yelloivs and Oranges (chrome rutile, nickel rutile, bismuth vanadate, naphthol, arylide, diarylide, isoindoline, benzimidazolone).
The spectrophotometric titrations of triazole ligand 1 carrying naphthol group with Cu2+ Co2+ Cd2+ Ni2+ and Pb2+ cations point outthe complexation properties of the ligand in aqueous solutions and methanol:water media (1:1) by using Buschmann and Valeur's methods respectively.
The solid (514 mg) was recrystallised from ethyl acetate to give Naphthol glucoside as light brown plates (480 mg), molecular formula found ([C.
Classical grades are workhorse yellow, orange, and red pigments, such as azo salts and diarylide and naphthol compounds.
Naphthol blue black (dye content [greater than or equal to] 85%)
Also naphthol red, RT172D and RT170D (PR170s) with bright masstone colorshade for PE and PP; and calcium precipitated monoazo yellows, YT362D (PY62) and YT369D (PY169) for polyolefins and styrenics.
In order to study the mechanism of reaction, nitroso naphthol was reacted with tyramine and 1,2-Benzo-8-(2-aminoethyl)-3-phenoxazone (BAP) was produced.
The tubes grow down an enclosed groove on the upper surface of each stylar arm, and can be measured under a x 10 dissecting microscope after opening the groove with forceps and staining with naphthol blue-black (Carney et al.
Tanneries washed sulpho naphthol (used as a preservative to store the hides in shipping), sulphide of arsenic and lime as well as organic fats, dyes and other chemicals into the waters of New England.
For example, in a study of diverse compound classes, the Corona CAD detected all analytes (with exception of Naphthol, a low MW, volatile compound) and even detected compounds without chromophores.
Chinese prices and supply of red pigments have already been affected by the recent closure of a relatively big producer of the intermediate naphthol for breaching environmental regulations.
ALP in cell cultures was determined using naphthol phosphate substrate and fast violet B to visualize the product, at pH 9.