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 ?
Tensile strength, elongation, and modulus of the cured sheets with phenanthrene, 2-naphthol, and quinoline of model coal tar components are presented in Table 5.
However, the curing time of the system with 2-naphthol was longer than the others.
Dynamic Viscoelasticity of Cured Sheets with Phenanthrene, 2-Naphthol, and Quinoline
The dynamic viscoelasticity of cured sheets with phenathrene, 2-naphthol, and quinoline was measured.
9% of total variance in urinary 1- and 2-naphthol levels, respectively (Table 2).
Interestingly, we also observed greater postexposure urinary 2-naphthol levels than postexposure urinary 1-naphthol levels (p < 0.
Although breathing-zone naphthalene was a significant factor contributing to both urinary 1- and 2-naphthol levels in our analyses, it most likely represents an overestimation of the inhalation exposure level under these conditions.
One limitation of the data set we analyzed is that preexposure levels of urinary 1- and 2-naphthol were missing for roughly half of our study subjects.
Urinary 1- and 2-naphthol levels were measured as described by Serdar et al.
Tables 2 and 3 present summary statistics of benzene, naphthalene, and 1- and 2-naphthol in urine samples collected, respectively, before and after the work shift from subjects classified by exposure category and smoking status.
In the present study, we investigated levels of benzene, naphthalene, and 1- and 2-naphthol in the urine of smoking and nonsmoking workers expected to have low, moderate, and high exposure to JP-8.
When we aggregated postexposure levels of urinary naphthalene and 1- and 2-naphthol by exposure category, the values supported the a priori categorization based upon job title (Table 3).