Naphthols


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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Naphthols

 

hydroxynaphthalenes, naphthalene derivatives of the general formula C10H8n(OH)a. The commercially valuable forms are α and β-naphthols and 1,5-, 1,8-, 2,3-, and 2,7-dihydroxynaphthalenes; the latter occur as colorless crystalline solids that are moderately soluble in water but insoluble in weak acids. Naphthols and their derivatives (mainly sulfonic acids) are used in the manufacture of dyes; β-naphthol methyl ether (yara-yara) and β-naphthol ethyl ether (neroli oil) are used in cosmetics manufacture for the preparation of soap perfumes. The largest single use of β-naphthol is in the manufacture of phenyl-β-naphthylamine (a stabilizing agent for natural and synthetic rubber).

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
As we can see, when the molar ratio of [PhCOOH]/[Al] was 0.1, the catalytic activity was significantly increased compared with that of the non-modifier system, which was similar to the results when phenol and naphthol were used with the same dosage.
Thirty-three phenolic compounds, predominantly phenol, alkyl phenol, thymol, naphthol and alkyl naphthol, were identified in the final enriched product.
Dose-dependent production of urinary naphthols among workers exposed to jet fuel (JP-8).
All the corresponding 1-amido/thioamidoalkyl-2 naphthols (4a-v) were synthesized in good to excellent isolated yields without any special purification methods, although in some cases the reactions proceeded rather slowly.
Types of pigments: Blues (phtholocyanine), Greens (phtholocyanine), Reds (monoazo, naphthol, DPP, quinacridone), Yellow and oranges (monoazo, disazo, benzimidazolone, isoindoline, isoindolinine)
A solution of naphthol (100 mg, 0.69 mmol) and 4-aminoantipyrine (141 mg, 0.69 mmol) formaldehyde (1mL) in 10 mL of methanol was stirred for 72 h at room temperature.
Of oxygen compounds, chiefly phenols occur in coal tar, implying that naphthols may exist as O1 compounds.
Although recent reports have suggested that the naphthols might be useful biomarkers of exposure to polycyclic aromatic hydrocarbons (naphthalene is the simplest such compound; Bouchard et al.
Types of pigments: Blacks (Carbon blacks); Blues (Indanthrone, Ultramarine, Phthalo basic dye); Greens (Phthalo.); Reds (DPP, Naphthols, Anthraquinone, Toluidine, Anthanthrone, Bon Maroon Quinacridone) Yellow and Oranges (Bismuth Vanadale, Diarylide, Monoflag, Benzimidazolone, Hybrids, Isoindolinone, Dianisidine)
A recognized leader in the supply of Diarylide yellows, Naphthol reds, 2B reds, Alkali blue and Carbazole Violets, we offer special grades of pigment for maximum transparency and gloss for packaging inks.
Types of pigments: Blues (Phthalos R/S, G/S, Non-floccalating), Greens (Phthalo green), Reds (Naphthol, DPP, Azo),Yellow and Oranges(High-performance, Monoazo, Benzimidazolone, Benzimidazolone)
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)