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 It might be outdated or ideologically biased.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 C10H8–n(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.
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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.
Effects of Methylaluminoxane Modifications on Tuning the Bis(Imino)Pyridyl Iron-Catalyzed Oligomerization of Ethylene
Thirty-three phenolic compounds, predominantly phenol, alkyl phenol, thymol, naphthol and alkyl naphthol, were identified in the final enriched product.
EXTRACTION AND SPECTROSCOPY ANALYSIS OF BASIC NITROGEN AND PHENOLIC COMPOUNDS OF THE SHALE OIL OF BAOMING OIL SHALE, CHINA
Dose-dependent production of urinary naphthols among workers exposed to jet fuel (JP-8).
Dermal exposure to jet fuel JP-8 significantly contributes to the production of urinary naphthols in fuel-cell maintenance workers
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.
Salicylic Acid-catalyzed Three-component Synthesis of 1-Amido/thioamidoalkyl-2-naphthols Under Solvent-free Conditions
Types of pigments: Blues (phtholocyanine), Greens (phtholocyanine), Reds (monoazo, naphthol, DPP, quinacridone), Yellow and oranges (monoazo, disazo, benzimidazolone, isoindoline, isoindolinine)
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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.
Design and synthesis of two oxazine derivatives using several strategies
Of oxygen compounds, chiefly phenols occur in coal tar, implying that naphthols may exist as O1 compounds.
Analysis and identification of oxygen compounds in Longkou Shale Oil and Shenmu coal tar
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.
Urinary biomarkers of exposure to jet fuel (JP-8)
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)
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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.
Clariant Corporation
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)
Pigments directory
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)
Pigment suppliers directory: the following pages contain a directory of select pigment suppliers and their products. For more information on the products listed in this guide, contact the companies directly

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