/naf"thawl, -thol, nap"-/, n. Chem.
either of two isomeric hydroxyl derivatives, C10H7OH, of naphthalene (alpha-naphthol or 1-naphthol and beta-naphthol or 2-naphthol), white or yellowish crystals, with a phenolic odor, that darken on exposure to light: used chiefly in dyes, drugs, perfumes, and insecticides. Also called hydroxynaphthalene.
[1840-50; NAPHTH- + -OL1]

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      either of two colourless, crystalline organic compounds derived from naphthalene and belonging to the phenol family; each has the molecular formula C10H7OH. Both compounds have long been identified with the manufacture of dyes and dye intermediates; they also have important uses in other areas of the chemical industry.

      The compound 1-naphthol, or α-naphthol, made by heating 1-naphthalenesulfonic acid with caustic alkali or by heating 1-naphthylamine with water under pressure, is used directly in making several dyes, and large amounts of it are converted to compounds ultimately incorporated into other dyes.

      The compound 2-naphthol, or β-naphthol, is regarded as the most important chemical intermediate based on naphthalene. It is manufactured by fusing 2-naphthalenesulfonic acid with caustic soda and is converted into numerous dyes and dye intermediates, as well as into tanning agents, antioxidants, and antiseptics. It has been shown to be carcinogenic.

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Universalium. 2010.

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  • Naphthol — Naph thol, n. [Naphthalene + ol.] (Chem.) Any one of a series of hydroxyl derivatives of naphthalene, analogous to phenol. In general they are crystalline substances with a phenol (carbolic) odor. [1913 Webster] {Naphthol blue}, {Naphthol orange} …   The Collaborative International Dictionary of English

  • Naphthol — may refer to: 1 Naphthol 2 Naphthol This disambiguation page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article …   Wikipedia

  • naphthol — [naf′thōl΄, naf′thôl΄; nap′thōl΄, nap′thôl΄] n. [ NAPHTH(ALENE) + OL1] either of two white, crystalline isomeric compounds, C10H7OH, derived from naphthalene and used as antiseptics and in dyes, pharmaceuticals, etc …   English World dictionary

  • Naphthol — Naphthole Name 1 Naphthol 2 Naphthol Andere Namen α Naphthol, 1 Hydroxynaphthalin β Naphthol, 2 Hydroxynaphthalin Strukturformel …   Deutsch Wikipedia

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  • Naphthol — Naph|thol 〈n. 11; Chem.〉 1. 〈i. e. S.〉 1 N., ein Naphthalinmolekül, das am Kohlenstoff 1 eine Hydroxylgruppe trägt 2. 〈i. w. S.〉 Oberbegriff für verschiedene Naphthalinmoleküle, die eine od. mehrere Hydroxylgruppen im Molekül aufweisen… …   Universal-Lexikon

  • naphthol — noun either of two phenols derived from naphthalene • Hypernyms: ↑phenol • Hyponyms: ↑alpha naphthol, ↑beta naphthol …   Useful english dictionary

  • naphthol AS — noun Usage: usually capitalized N Etymology: German naphthol AS, from naphthol + AS, from anilid anilide + säure acid 1. : a crystalline phenolic anilide HOC10H6CONHC6H5 used as a coupling component for azoic dyes; the anilide of 3 hydroxy 2… …   Useful english dictionary

  • naphthol — /ˈnæfθɒl/ (say nafthol) noun either of two hydroxy derivatives of naphthalene, having the formula C10H7OH, and occurring in coal tar, used as antiseptics and in dye manufacture. See beta naphthol. Also, naphtol /ˈnæftɒl/ (say naftol). {naphth(a)… …  

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