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 ?
The degradation products from the reference strains Citrobacter DBS 13, Escherichia coli DH5[+ or -], Escherichia coli E2348/69, Enterobacter cloacae and the intestinal microbiota Enterobacter sp showed a very similar RT in comparison with the control 1-naphthol at 285 and 315nm.
There is evidence that 1-naphthol and 2-naphthol act as EDCs through thyroid hormone receptor antagonist activity (Sun et al.
1-naphthyl phosphatase, 1-naphthol, ethylenediaminetetraacetic acid, bovine serum albumin (BSA), nitro blue tetrazolium and Tween 20 were obtained from Sigma Chemical Co.
Figure 2 presents the cumulative distributions of urinary 1-naphthol to 2-naphthol ratios in the CHAMACOS cohort and NHANES.
For example, 1-naphthol is a metabolite of both naphthalene (used as a moth repellent and also a polycyclic aromatic hydrocarbon from combustion processes) and carbaryl (Shealy et al.
Our results show that both inhalation exposure and smoking significantly contributed to urinary 1-naphthol levels.
In the present study we explored whether environmental exposures to 1-naphthol (1N), a metabolite of carbaryl and naphthalene, and 3,5,6trichloro-2-pyridinol (TCPY), a metabolite of chlorpyrifos and chlorpyrifos-methyl, are associated with decreased semen quality in humans.
8]]naphthalene ([greater than or equal to] 98 atom% D), 1-naphthol ([greater than or equal to] 99%), 2-naphthol ([greater than or equal to] 99%), [[sup.
42 for 1-naphthol, 3,5,6-trichloropyridinol, and 4-nitrophenol, respectively.
5 ND Carbamates Bendiocarb 5 97 49 ND Carbofuran 1 89 45 ND Carbofuranphenol (a) 1 0 0 -- 1-Naphthol (a) 20 42 21 ND Propoxur 1-2 7 3.