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 (năf′thôl′, -thōl′, -thŏl′, năp′-) also naph·tol (-tôl, -tōl, -tŏl)
A hydroxy derivative of naphthalene, C10H8O, occurring in two isomeric forms: alpha-naphthol, used in making dyes and perfumes, and beta-naphthol, used in making antioxidants, pigments, dyes, and pharmaceuticals.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ˈnæfθɒl; ˈnæp-)
(Chemistry) a white crystalline solid having two isomeric forms, alpha-naphthol, used in dyes, and beta-naphthol, used in dyes and as an antioxidant. Formula: C10H7OH
[C19: from naphtha + -ol1]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈnæf θɔl, -θɒl, ˈnæp-)

either of two isomeric hydroxyl derivatives, C10H7OH, of naphthalene: used chiefly in dyes, drugs, perfumes, and insecticides.
[1840–50; napth(a) + -ol1]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.naphthol - either of two phenols derived from naphthalene
alpha-naphthol - an isomer of naphthol used in dyes
beta-naphthol - an isomer of naphthol used in rubber as an antioxidant
phenol - any of a class of weakly acidic organic compounds; molecule contains one or more hydroxyl groups
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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.
As per our interest to develop better protocols for the synthesis of biologically active heterocyclic molecules, we would like to report the synthesis of a series of new 3,4-dihydro-3-substituted-2H-naphtho[2,1-e][1,3] oxazine derivatives using 2 naphthol, formalin and various anilines as substrates in presence of Potassium Dihydrogen Phosphate catalyst.
Types of pigments: Blues (phthalocyanine, triarylcarbonium); Greens (phthalocyanine, chromium); Reds (naphtol, quinacridone, BONA, triarylcarbonium, perylene, anthraquinone, benzimidazolone, DPP); Specialty (pearlescent); Yellow and oranges (monoazo, diarylide, isoindolinone, benzimidazolone, isacetoacetarylide, quinophthalone, lead Chromate, orange: naphthol, disazopryazalone, diarylide, benzimidazolone, perinone, azoheterocyclues, DPP)
Thirty-three phenolic compounds, chiefly phenol, alkyl phenol, thymol, naphthol and alkyl naphthol, were identified in the concentrated product 2 by GC-MS, with the relative content of 87.57%.
"Most organic pigment technologies are challenged: diarylide yellows; Y12; Y13; Y14; Y62; Y65; Y74; Y174; Chinese-made DCB; AAA; AAOT; AAMX' R48s & R57:1s; Chinese-made 2B&4B acid; R53:l with limited CLT acid; V3; V27 and R169; R146; R184 (naphthol AS series);Y83 (DCB andAsIRG); 05; 013; and 034 (PTMP/PMP)," Pfefferkorn said.
Sondengam, "Coupling of the diazonium sulphate of 3-amino-4H-benzo[f]thieno[3, 4-c](2H)chromen-4-one with phenol and naphthol derivatives in varied stoichiometries," Trends in Organic Chemistry, vol.
As shown in Figure 5, the lowest energy docked conformation for 1:1 complex of CB7/SY was obtained, which indicated that the naphthol part of the SY molecule was inserted into the cavity of the CB7 host molecule, while the benzene sulfonic acid group of the SY molecule was located at the outside of the CB7 host.
The precise study of organic materials in cultural heritage works was investigated on painting cross sections since the early 1970s using staining methods with organic dyes such as naphthol blue black [2] for the specific detection of proteins, allowing an in situ microcharacterization of egg-based or collagen-based materials.
Briefly, the MII oocytes were placed in a solution of 15 mg N-Phenyl-p-phenylene diamine (p-aminodiphenylamine), 15 mg naphthol AS-LG 0.1 ml ethanol 100%, 50 ml tris-HCl buffer (pH=7.2-7.4) and BSA (5 mg/ml) after washing in phosphate-buffered saline supplemented with 5% BSA and then, incubated at 37 [degrees]C for 60 min.
Later, these authors [13] compared different dyes to analyze the sensitivity of LAMP assay, including hydroxy naphthol blue (HNB), calcein, and SYBR Green: the first two being added before the reaction and the last one after the reaction.
([+ or -])-Camphor-10-sulfonic acid (CSA) is an effective, safe, water-soluble, and reusable organocatalyst for various organic reactions, for instance, Friedel-Crafts reactions [29], synthesis of dioxabicyclo[3.3.1]nonane and [beta]-amino naphthol compounds [30, 31], and synthesis of spirocyclic compounds [32], and is also frequently used in the optical resolution of amines [33].
Key statement: A tire component comprising a rubber composition having a highly unsaturated diene elastomer and a reinforcing filler with a first methylene acceptor selected from 3-hydroxydiphenylamine, 4-hydroxydiphenylamine or combinations thereof; a second methylene acceptor selected from a Novolac resin, diphenylolmethane, diphenylolethane diphenylolpropane, diphenylolbutane, a naphthol, a cresol or combinations thereof and a methylene donor.