Naphthols


Also found in: Dictionary, Thesaurus, Medical.

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).

References in periodicals archive ?
The oxygen compounds in the acid fractions of LSO and SLTCT are represented by phenols, indanols, naphthols, phenylphenols, fluorenols and phenanthrenols, and their derivatives.
Regression analysis for urinary naphthol levels of entrants using end-exhaled breath naphthalene as an inhalation marker (model 2).
In this data set, smoking status is significantly associated with preexposure urinary naphthol levels but not with postexposure urinary naphthol levels.
Only urinary naphthols were adjusted for creatinine, and all statistical tests were repeated with and without adjustment.
Concentrations of naphthalene and the naphthols were also 2-fold higher in the moderate-exposure group than the low-exposure group.
9%, respectively, in postexposure samples when naphthols were adjusted for urinary creatinine (data not shown).
We observed much lower levels of naphthalene in urine than those of the naphthols, which is not surprising because relatively small amounts (< 1-2%) of unmetabolized aromatic compounds are eliminated in urine (Ghittori et al.
Previous studies suggested two-phase excretion kinetics for the naphthols in urine, consisting of a rapid phase with half-lives ([t.
In each exposure category, smokers had higher levels of urinary benzene, naphthalene, and the naphthols in both pre- and postexposure samples.
Thus, we anticipated that smokers would have somewhat higher levels of urinary naphthalene and the naphthols than nonsmokers.
Of these, the naphthols are probably more useful because of their greater abundance and slower elimination kinetics.