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.
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References in periodicals archive ?
In this article, various chemicals like phenol, anisole, naphthols, benzoic acid, and phenol-like alcohols were employed as the MAO modifiers to tune the oligomerization activity and product distribution of the BIP-Fe catalyst.
Types of pigments: Blacks (carbon black), Blues (indanthrone blue, phthalocyanine blue, PMA/PTA Toners/Lake), Corrision inhibiting (zinc flake, zinc paste), Greens (phthalocyanine green), Iron oxide pigments (black iron oxide), Metallic pigments (aluminum paste, aluminum powders, gold bronze powders), Reds (bon red/maroon; lithol rubine; naphthol red; arylide red and maroon; perylene maroon, red, scarlet and violet, quinacridone maroon, red and violet; toluidine red), Specialty pigments (color shifting, color variable)
Furthermore, phenol made up 0.6% of the concentrated product 2, thymol 1.10% and naphthols 3.32%.
The alkaline phosphatase reactions were negative for freshly prepared cells and cryosections, with two different substrates (naphthol AS-BI phosphate and [alpha]-naphthol phosphate).
The solution studies of trenhynaph by potentiometric and spectrophotometric methods revealed that three protonation constants can be assigned to hydroxyl group of naphthol moiety.
This paper describes the complexation properties of 124-triazole compounds carrying naphthol group with some heavy metal cations by using UV-visible spectrometry.
1,3,4-Thiadiazol azo dye coupled with 8-hydroxy quinoline showed higher active antioxidant capacity than 1,3,4-thiadiazol azo dye coupled with naphthol. The preliminary antimicrobial activity studies revealed that the azo dye having 1,3,4-thiadiazole moiety exhibited a potential antimicrobial activity.
Color was developed for 10 minutes at room temperature with a fast red substrate containing naphthol AS-MX phosphate (Dako) (100 mM Tris-HCl buffer, pH 8.2, containing naphthol phosphate, fast red, and levamisole).
The meristemoids were intensely stained with naphthol blue.
Subunit (A) and (B) are linked to give the Naphthol glucoside (2).
Most classes of these pigments, including [beta]-naphthol, Naphthol AS, mono- and di-arylide yellows, quinacridones, copper phthalocyanines, benzimidazolones, and perylenes give good diffraction data.