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 ?
Table 4: Diffraction data for Naphthol AS pigments CI pigment name Supplier d spacings (intensity) (number) PR2 (12310) Heubach 10.
Types of pigments: Iron oxides (Transparent iron oxides yellow and red), Reds (Naphthols, Bona, Beta Naphthols, Benzimidazolone), Yellow and oranges (Bismuth Vanadates, Benzimidazolone, mono Azo, diarylide, Pyrazolone)
China is the most important global source of Beta Naphthol derived intermediates for producing red pigments such as Red 57:1, Red 22, and Red 48.
Naphthol Red 188 was larger, and Hansa yellow 3 had the largest pigment particle size with the smallest surface area.
Developed for industrial OEM and maintenance coatings, Naphthol red 3172 has also shown "superior" heat stability in plastics, the manufacturer says.
Enduronone HP-7177, an opaque anthraquinone pigment red 177; and Naphthol Red Naphthanil Red RT-172-D, a bright masstone pigment red 170 for PE and PP.
ALP in cell cultures was determined using naphthol phosphate substrate and fast violet B to visualize the product, at pH 9.
Closure of capacity due to stricter environmental rules was also causing shortages of key intermediates, like beta naphthol for red pigments.
The SAAP method was completed by sequential application of normal horse serum (serum block) for 20 minutes, primary antibody for 1 hour, biotinylated horse anti-mouse immunoglobulin G (IgG) for 30 minutes, streptavidin-alkaline phosphatase complex (Bethesda Research Laboratories, Gaithersburg, Md) for 30 minutes, and naphthol AS-BI phosphate/hexazotized new fuchsin (Histomark Red, Kirkegaard and Perry Laboratories, Gaithersburg, Md) for 50 minutes (all steps at room temperature).
Comment: RWP1460 is a highly pigmented naphthol red aqueous dispersion that can be used in both specialty ink and coatings applications.
This leads to two optical antipodes, which can exist in different cisoid and transoid states defined by the dihedral (torsional) angle between the two naphthol moieties (10, 11).
Types of pigments: Blacks (carbon black); Blues (phthalo, indanthrene, milori); Corrosion inhibiting (zinc phosphate, zinc chromate); Greens (phylo, chromium oxide); Iron oxide pigments (synthetic micronized and nonmicronized zinc ferrite) Metallic pigments (aluminum); Reds (high performance, naphthol, toluidine, azo, quinacridone, perylene, DPP)