2-Naphthol

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  • Identifiers

    CAS number
    135-19-3

    Molecular formula
    C10H8O

    SMILES
    C1=CC=C2C=C(C=CC2=C1)O

    Safety labels

    Irritant
    Irritant

    Environmental Hazard
    Environmental

  • Odor profile

    Fragrance
    Phenolic 78.59%
    Medicinal 54.89%
    Animal 44.45%
    Woody 37.19%
    Leathery 34.92%
    Smoky 32.22%
    Floral 31.92%
    Sweet 31.84%
    Burnt 30.85%
    Musty 30.83%

     

    Flavor
    Phenolic 66.38%
    Medicinal 46.98%
    Plastic 37.56%
    Phenol 36.33%
    Fecal 34.87%
    Geranium 33.37%
    Medical 31.43%
    Naphthyl 29.56%
    Animal 28.85%
    Rubber 28.45%

     

    Odor impact est.
    Low

    Odor threshold

    • Odor Threshold Low: 0.01 [ppm]. Odor Threshold High: 11.4 [ppm]. [HSDB] Odor threshold from HSDB
    • 0.01 ppm - 11.4 ppm

  • Properties

    XLogP3-AA
    2.7

    pKa est.
    9.16 (weak base)

    Molecular weight
    144.17 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Ultra slow

    Melting point expt.

    • 121.6 °C
    • 123 °C
    • 122 °C

    Boiling point

    • 285 °C
    • 285.00 to 286.00 °C. @ 760.00 mm Hg

    Flash point

    • 143.59 ˚C est.
    • 152.7 °C
    • 153 °C
    • 153 °C (307 °F) (Closed cup)
    • 307 °F (153 °C) (Closed cup)

    Solubility expt.

    • In water, 7.55X10+2 mg/L at 25 °C
    • Soluble in alcohol, ether, chloroform, glycerol, oils, alkaline solutions
    • Very soluble in ethanol, ethyl ether; soluble in benzene, chloroform; slightly soluble in ligroin
    • 1 gram dissolves in 1000 mL water, 80 mL boiling water, 0.8 mL alcohol, 17 mL chloroform, 1.3 mL ether
    • 755 mg/L @ 25 °C (exp)
    • Solubility in water, g/100ml at 25 °C: 0.074

  • Synonyms

    • 2-NAPHTHOL
    • naphthalen-2-ol
    • 135-19-3
    • beta-naphthol
    • 2-Naphthalenol
    • Betanaphthol
    • 2-Hydroxynaphthalene
    • Isonaphthol
    • Developer A
    • Developer BN
    • Naphthol B
    • 2-Naphtol
    • Azogen developer A
    • beta-Naphtol
    • beta-Napthol
    • Developer AMS
    • 2-Naftolo
    • beta-Hydroxynaphthalene
    • 2-Naftol
    • Developer sodium
    • C.I. Developer 5
    • .beta.-Naphthol
    • beta-Naftolo
    • beta-Monoxynaphthalene
    • beta-Naftol
    • beta-Naphthyl alcohol
    • beta-Naphthyl hydroxide
    • NAPHTHOL, BETA
    • 2-Naftol [Dutch]
    • beta-Naftol [Dutch]
    • 2-Naphtol [French]
    • Caswell No. 590
    • C.I. Azoic Coupling Component 1
    • 2-Naftolo [Italian]
    • Antioxygene BN
    • beta-Naphtol [German]
    • beta-Naftolo [Italian]
    • .beta.-Hydroxynaphthalene
    • Betanaphthol [NF]
    • NSC 2044
    • MFCD00004067
    • C.I. 37500
    • Hydronaphthol
    • HSDB 6812
    • UNII-P2Z71CIK5H
    • .beta.-Naftolo
    • .beta.-Naphtol
    • .beta.-Napthol
    • .beta.-Naftol
    • naphth-2-ol
    • EINECS 205-182-7
    • P2Z71CIK5H
    • EPA Pesticide Chemical Code 010301
    • 2-Naphthol(Flakes or Chunks)
    • DTXSID5027061
    • CHEBI:10432
    • AI3-00081
    • beta.-hydroxynaphthalene
    • .beta.-Naphthyl alcohol
    • .beta.-Monoxynaphthalene
    • NSC-2044
    • BETANAPHTHOL [II]
    • .beta.-Naphthyl hydroxide
    • 2-NAPHTHOL [MI]
    • BETANAPHTHOL [HSDB]
    • BETANAPHTHOL [MART.]
    • BETANAPHTHOL [WHO-DD]
    • CHEMBL14126
    • DTXCID907061
    • Naphthalen-2-ol (beta-Naphthol)
    • EC 205-182-7
    • 2-Naftol (Dutch)
    • beta-Naftol (Dutch)
    • 2-Naphtol (French)
    • 2-Naftolo (Italian)
    • beta-Naphtol (German)
    • beta-Naftolo (Italian)
    • TOLNAFTATE IMPURITY A [EP IMPURITY]
    • BETANAPHTHOL (II)
    • BETANAPHTHOL (MART.)
    • 2-Napththol
    • CAS-135-19-3
    • TOLNAFTATE IMPURITY A (EP IMPURITY)
    • betanapthol
    • betaNaftol
    • betaNaftolo
    • betaNaphtol
    • Naphthols
    • 2Naphthalenol
    • 2Naftolo
    • 2Naphtol
    • 2Naftol
    • 2-napthol
    • napthalen-2-ol
    • 2-naphthylalcohol
    • 2hydroxynaphthalene
    • Naphthol, .beta.
    • 03V
    • betaNaphthyl alcohol
    • betaMonoxynaphthalene
    • EINECS 215-322-9
    • betaHydroxynaphthalene
    • betaNaphthyl hydroxide
    • 2-hydroxy naphthalene
    • 2-Naphthol, Reagent
    • 2-Naphthol, Purified
    • BRN 1817321
    • 2-Naphthol, 98%
    • 2-Naphthol, 99%
    • Naphth-2-ol, 10
    • Microcidin (Salt/Mix)
    • 2-Naphthol, 98.5%
    • 2-NAPHTHOL [INCI]
    • SCHEMBL28781
    • WLN: L66J CQ
    • SGCUT00131
    • 2-Naphthol, LR, >=98%
    • C.I.Azoic Coupling Component 1
    • NSC2044
    • 4b32
    • Sodium 2-naphthoxide (Salt/Mix)
    • HMS3264N15
    • Pharmakon1600-01504501
    • HY-Y0110
    • to_000010
    • Tox21_201884
    • Tox21_303038
    • BDBM50159250

  • Applications

    2-Naphthol (CAS 135-19-3) is primarily used as an intermediate in the synthesis of azo dyes and napthol-based pigments for textiles, leather, and printing inks; it also serves as a phenolic building block in novolac resins used as binders in coatings, adhesives, and printed materials. Additionally, it participates in dye-intermediate chemistry for cosmetics (hair-color formulations) and other dye derivatives via diazonium coupling; in certain systems, it may be used in electronics-related resins and photoresist formulations, subject to local regulations.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 885.8
    methanol 452.17
    isopropanol 584.15
    water 0.83
    ethyl acetate 1080.28
    n-propanol 715.44
    acetone 1640.66
    n-butanol 612.57
    acetonitrile 1291.72
    DMF 1644.19
    toluene 262.66
    isobutanol 393.73
    1,4-dioxane 2125.92
    methyl acetate 888.44
    THF 2083.81
    2-butanone 1169.01
    n-pentanol 326.73
    sec-butanol 406.23
    n-hexane 66.21
    ethylene glycol 96.74
    NMP 556.17
    cyclohexane 66.89
    DMSO 1514.98
    n-butyl acetate 742.83
    n-octanol 226.82
    chloroform 899.01
    n-propyl acetate 599.07
    acetic acid 393.93
    dichloromethane 1450.52
    cyclohexanone 931.27
    propylene glycol 100.3
    isopropyl acetate 433.86
    DMAc 617.92
    2-ethoxyethanol 436.38
    isopentanol 338.44
    n-heptane 142.44
    ethyl formate 765.28
    1,2-dichloroethane 1210.9
    n-hexanol 538.47
    2-methoxyethanol 831.85
    isobutyl acetate 275.41
    tetrachloromethane 131.38
    n-pentyl acetate 296.75
    transcutol 988.06
    n-heptanol 229.72
    ethylbenzene 171.72
    MIBK 375.87
    2-propoxyethanol 748.06
    tert-butanol 459.56
    MTBE 410.96
    2-butoxyethanol 334.21
    propionic acid 395.0
    o-xylene 140.57
    formic acid 76.07
    diethyl ether 1021.21
    m-xylene 166.29
    p-xylene 176.42
    chlorobenzene 268.01
    dimethyl carbonate 326.04
    n-octane 52.13
    formamide 333.79
    cyclopentanone 1381.24
    2-pentanone 992.3
    anisole 391.25
    cyclopentyl methyl ether 640.51
    gamma-butyrolactone 1555.7
    1-methoxy-2-propanol 549.72
    pyridine 928.94
    3-pentanone 600.66
    furfural 665.6
    n-dodecane 35.89
    diethylene glycol 333.66
    diisopropyl ether 177.38
    tert-amyl alcohol 292.52
    acetylacetone 734.24
    n-hexadecane 40.37
    acetophenone 275.84
    methyl propionate 738.48
    isopentyl acetate 429.0
    trichloroethylene 1381.23
    n-nonanol 191.11
    cyclohexanol 281.47
    benzyl alcohol 192.55
    2-ethylhexanol 273.36
    isooctanol 167.92
    dipropyl ether 701.13
    1,2-dichlorobenzene 201.01
    ethyl lactate 154.31
    propylene carbonate 587.91
    n-methylformamide 861.73
    2-pentanol 325.1
    n-pentane 66.52
    1-propoxy-2-propanol 483.45
    1-methoxy-2-propyl acetate 448.91
    2-(2-methoxypropoxy) propanol 227.77
    mesitylene 97.1
    ε-caprolactone 749.08
    p-cymene 117.43
    epichlorohydrin 1894.99
    1,1,1-trichloroethane 610.24
    2-aminoethanol 210.2
    morpholine-4-carbaldehyde 810.37
    sulfolane 969.52
    2,2,4-trimethylpentane 22.13
    2-methyltetrahydrofuran 1168.88
    n-hexyl acetate 379.98
    isooctane 25.11
    2-(2-butoxyethoxy)ethanol 372.9
    sec-butyl acetate 266.13
    tert-butyl acetate 334.99
    decalin 39.77
    glycerin 122.69
    diglyme 839.72
    acrylic acid 254.91
    isopropyl myristate 157.44
    n-butyric acid 610.17
    acetyl acetate 378.85
    di(2-ethylhexyl) phthalate 92.91
    ethyl propionate 476.38
    nitromethane 1231.95
    1,2-diethoxyethane 701.32
    benzonitrile 308.57
    trioctyl phosphate 89.59
    1-bromopropane 649.91
    gamma-valerolactone 1303.07
    n-decanol 151.07
    triethyl phosphate 129.21
    4-methyl-2-pentanol 147.89
    propionitrile 863.68
    vinylene carbonate 520.83
    1,1,2-trichlorotrifluoroethane 388.71
    DMS 274.33
    cumene 105.65
    2-octanol 152.62
    2-hexanone 596.13
    octyl acetate 196.03
    limonene 168.93
    1,2-dimethoxyethane 1153.78
    ethyl orthosilicate 121.39
    tributyl phosphate 109.33
    diacetone alcohol 349.63
    N,N-dimethylaniline 199.31
    acrylonitrile 904.81
    aniline 242.34
    1,3-propanediol 400.04
    bromobenzene 252.97
    dibromomethane 885.25
    1,1,2,2-tetrachloroethane 795.25
    2-methyl-cyclohexyl acetate 205.37
    tetrabutyl urea 154.34
    diisobutyl methanol 158.45
    2-phenylethanol 235.51
    styrene 187.16
    dioctyl adipate 174.66
    dimethyl sulfate 341.72
    ethyl butyrate 507.11
    methyl lactate 181.09
    butyl lactate 165.96
    diethyl carbonate 267.13
    propanediol butyl ether 213.18
    triethyl orthoformate 218.72
    p-tert-butyltoluene 104.47
    methyl 4-tert-butylbenzoate 225.45
    morpholine 1724.37
    tert-butylamine 259.18
    n-dodecanol 122.42
    dimethoxymethane 1156.18
    ethylene carbonate 502.45
    cyrene 187.87
    2-ethoxyethyl acetate 390.35
    2-ethylhexyl acetate 312.58
    1,2,4-trichlorobenzene 204.31
    4-methylpyridine 664.93
    dibutyl ether 394.86
    2,6-dimethyl-4-heptanol 158.45
    DEF 762.71
    dimethyl isosorbide 388.23
    tetrachloroethylene 483.93
    eugenol 213.45
    triacetin 251.14
    span 80 184.68
    1,4-butanediol 125.07
    1,1-dichloroethane 948.93
    2-methyl-1-pentanol 207.23
    methyl formate 751.64
    2-methyl-1-butanol 317.48
    n-decane 59.5
    butyronitrile 827.28
    3,7-dimethyl-1-octanol 169.92
    1-chlorooctane 190.1
    1-chlorotetradecane 76.98
    n-nonane 64.64
    undecane 45.16
    tert-butylcyclohexane 40.39
    cyclooctane 32.13
    cyclopentanol 384.32
    tetrahydropyran 1467.6
    tert-amyl methyl ether 272.51
    2,5,8-trioxanonane 464.95
    1-hexene 268.72
    2-isopropoxyethanol 298.37
    2,2,2-trifluoroethanol 128.11
    methyl butyrate 630.01

    Scent© AI

1 4

IFRA standard 51

Recommendation
No restriction
Maximum acceptable concentrations in the finished product (%)
Category 1
Products applied to the lips
 No restriction Category 7A
Rinse-off products applied to the hair with some hand contact
 No restriction
Category 2
Products applied to the axillae
 No restriction Category 7B
Leave-on products applied to the hair with some hand contact
 No restriction
Category 3
Products applied to the face/body using fingertips
 No restriction Category 8
Products with significant anogenital exposure
 No restriction
Category 4
Products related to fine fragrance
 No restriction Category 9
Products with body and hand exposure, primarily rinse off
 No restriction
Category 5A
Body lotion products applied to the body using the hands (palms), primarily leave on
 No restriction Category 10A
Household care products with mostly hand contact
 No restriction
Category 5B
Face moisturizer products applied to the face using the hands (palms), primarily leave on
 No restriction Category 10B
Household care products with mostly hand contact, including aerosol/spray products (with potential leave-on skin contact)
 No restriction
Category 5C
Hand cream products applied to the hands using the hands (palms), primarily leave on
 No restriction Category 11A
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate without UV exposure
 No restriction
Category 5D
Baby Creams, baby Oils and baby talc
 No restriction Category 11B
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate with potential UV exposure
 No restriction
Category 6
Products with oral and lip exposure
 No restriction Category 12
Products not intended for direct skin contact, minimal or insignificant transfer to skin
 No restriction