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 ?
Characteristic 6-19 years n 3,189 1-naphthol (ng/L) 1604.
Hence, DEABS and +250 mV as potential were selected as the optimum conditions for amperometric registration of 1-naphthol.
The minimum detection limit of 1-naphthol is about 2 x [10.
The value in microamperes of this peak corresponded to the concentration of 1-naphthol, which is an AP enzymatic product.
8 Maximum Oxidation Potential, mV Buffer 1-Naphthol Phenol Nitro Solution * Phenol 0-1M BcBS +200 [+ or -] 40 +410 [+ or -] 20 -- 0.
Both 1-naphthol and 2-naphthol concentrations were determined from urine samples collected from each worker before and after the work shift.
i]) [ln(ng/L)] is the natural logarithm of either the ith worker's urinary 1-naphthol or urinary 2-naphthol level; [X.
In addition, postexposure urinary 2-naphthol levels were greater than postexposure urinary 1-naphthol levels (p < 0.
These results indicate that dermal exposure to naphthalene contributed significantly to urinary 2-naphthol levels but not to urinary 1-naphthol levels among the fuel-cell maintenance workers.
These results also suggest that dermal exposure to naphthalene contributes significantly to urinary 2-naphthol levels but not to urinary 1-naphthol levels.
The presence of 1-naphthol in the urine of industrial workers exposed to naphthalene.
d) Levels of detection provided for 1-naphthol and 2-naphthol, respectively, in urine.