4,4'-Bis(2-benzoxazolyl)stilbene

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  • Identifiers

    CAS number
    1533-45-5

    Molecular formula
    C28H18N2O2

    SMILES
    C1=CC=C2C(=C1)N=C(O2)C3=CC=C(C=C3)C=CC4=CC=C(C=C4)C5=NC6=CC=CC=C6O5

    Safety labels

    Irritant
    Irritant

    Environmental Hazard
    Environmental

  • Odor profile

    Fragrance
    Floral 69.44%
    Fruity 45.8%
    Animal 34.5%
    Rose 33.94%
    Neroli 30.68%
    Metallic 30.36%
    Geranium 29.86%
    Balsamic 28.79%
    Sweet 28.49%
    Pungent 28.01%

     

    Flavor
    Bitter 79.13%
    Animal 25.41%
    Very strong 23.25%
    Moth ball 23.05%
    Naphthelene 22.69%
    Indole 22.56%
    Nitrile 21.81%
    Cereal 20.5%
    Tar 19.72%
    Cedarleaf 19.45%

     

    Odor impact est.
    Low

  • Properties

    XLogP3-AA
    7.2

    pKa est.
    4.98 (weak acid)

    Molecular weight
    414.5 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Ultra slow

    Boiling point est.
    1291°C

    Flash point

    • 261.68 ˚C est.

  • Synonyms

    • 1533-45-5
    • 4,4'-Bis(2-benzoxazolyl)stilbene
    • DTXSID4051744
    • Benzoxazole, 2,2'-(1,2-ethenediyldi-4,1-phenylene)bis-
    • RefChem:506551
    • DTXCID0030299
    • 1,2-Bis(4-(benzo[d]oxazol-2-yl)phenyl)ethene
    • C28H18N2O2
    • 4,4'-Bis(1,3-benzoxazol-2-yl)stilbene
    • SCHEMBL231012
    • SCHEMBL29405696
    • ORACIQIJMCYPHQ-UHFFFAOYSA-N
    • 4,4'-bis(2-benzoxazolyl) stilbene
    • AKOS028110086
    • MSK163197-10D
    • DB-043188
    • B2729
    • NS00019645
    • 2,2\'-(1,2-Ethenediyldi-4,1-phenylene)bisbenzoxazole
    • Fluorescent brightener 393 Solution in DMSO, 10ug/mL
    • 2,2'-[Ethene-1,2-diyldi(4,1-phenylene)]bis(1,3-benzoxazole)
    • 2-[4-[2-[4-(1,3-benzoxazol-2-yl)phenyl]vinyl]phenyl]-1,3-benzoxazole
    • 1533-45-5

  • Applications

    4,4'-Bis(2-benzoxazolyl)stilbene is used primarily as a fluorescent dye and optical material, serving as a high-intensity emitter in polymer coatings, inks, and plastics to impart fluorescence under UV light; it is investigated as an organic emitter for OLEDs and other optoelectronic applications; it can be employed as a fluorescent probe or labeling agent in analytical contexts; and it serves as an intermediate in the synthesis of benzoxazole-containing dyes and advanced materials.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 0.03
    methanol 0.03
    isopropanol 0.02
    water 0.0
    ethyl acetate 0.04
    n-propanol 0.03
    acetone 0.02
    n-butanol 0.05
    acetonitrile 0.02
    DMF 0.01
    toluene 0.06
    isobutanol 0.02
    1,4-dioxane 0.11
    methyl acetate 0.03
    THF 0.33
    2-butanone 0.05
    n-pentanol 0.06
    sec-butanol 0.04
    n-hexane 0.01
    ethylene glycol 0.01
    NMP 0.01
    cyclohexane 0.01
    DMSO 0.09
    n-butyl acetate 0.06
    n-octanol 0.09
    chloroform 0.76
    n-propyl acetate 0.05
    acetic acid 0.05
    dichloromethane 0.83
    cyclohexanone 0.05
    propylene glycol 0.02
    isopropyl acetate 0.05
    DMAc 0.06
    2-ethoxyethanol 0.14
    isopentanol 0.05
    n-heptane 0.02
    ethyl formate 0.04
    1,2-dichloroethane 0.15
    n-hexanol 0.05
    2-methoxyethanol 0.1
    isobutyl acetate 0.04
    tetrachloromethane 0.04
    n-pentyl acetate 0.17
    transcutol 1.15
    n-heptanol 0.09
    ethylbenzene 0.08
    MIBK 0.06
    2-propoxyethanol 0.15
    tert-butanol 0.01
    MTBE 0.04
    2-butoxyethanol 0.25
    propionic acid 0.03
    o-xylene 0.04
    formic acid 0.04
    diethyl ether 0.07
    m-xylene 0.05
    p-xylene 0.05
    chlorobenzene 0.02
    dimethyl carbonate 0.03
    n-octane 0.02
    formamide 0.04
    cyclopentanone 0.06
    2-pentanone 0.05
    anisole 0.1
    cyclopentyl methyl ether 0.05
    gamma-butyrolactone 0.06
    1-methoxy-2-propanol 0.08
    pyridine 0.13
    3-pentanone 0.04
    furfural 0.1
    n-dodecane 0.02
    diethylene glycol 0.08
    diisopropyl ether 0.03
    tert-amyl alcohol 0.04
    acetylacetone 0.08
    n-hexadecane 0.02
    acetophenone 0.07
    methyl propionate 0.03
    isopentyl acetate 0.09
    trichloroethylene 0.4
    n-nonanol 0.13
    cyclohexanol 0.03
    benzyl alcohol 0.06
    2-ethylhexanol 0.06
    isooctanol 0.08
    dipropyl ether 0.11
    1,2-dichlorobenzene 0.03
    ethyl lactate 0.04
    propylene carbonate 0.04
    n-methylformamide 0.01
    2-pentanol 0.04
    n-pentane 0.01
    1-propoxy-2-propanol 0.12
    1-methoxy-2-propyl acetate 0.12
    2-(2-methoxypropoxy) propanol 0.51
    mesitylene 0.03
    ε-caprolactone 0.06
    p-cymene 0.06
    epichlorohydrin 0.21
    1,1,1-trichloroethane 0.06
    2-aminoethanol 0.02
    morpholine-4-carbaldehyde 0.05
    sulfolane 0.08
    2,2,4-trimethylpentane 0.01
    2-methyltetrahydrofuran 0.08
    n-hexyl acetate 0.18
    isooctane 0.01
    2-(2-butoxyethoxy)ethanol 0.6
    sec-butyl acetate 0.06
    tert-butyl acetate 0.08
    decalin 0.01
    glycerin 0.04
    diglyme 0.86
    acrylic acid 0.03
    isopropyl myristate 0.15
    n-butyric acid 0.05
    acetyl acetate 0.04
    di(2-ethylhexyl) phthalate 0.17
    ethyl propionate 0.06
    nitromethane 0.05
    1,2-diethoxyethane 0.41
    benzonitrile 0.04
    trioctyl phosphate 0.09
    1-bromopropane 0.12
    gamma-valerolactone 0.1
    n-decanol 0.09
    triethyl phosphate 0.08
    4-methyl-2-pentanol 0.04
    propionitrile 0.03
    vinylene carbonate 0.05
    1,1,2-trichlorotrifluoroethane 0.21
    DMS 0.08
    cumene 0.06
    2-octanol 0.08
    2-hexanone 0.07
    octyl acetate 0.13
    limonene 0.04
    1,2-dimethoxyethane 0.21
    ethyl orthosilicate 0.11
    tributyl phosphate 0.08
    diacetone alcohol 0.09
    N,N-dimethylaniline 0.08
    acrylonitrile 0.03
    aniline 0.04
    1,3-propanediol 0.05
    bromobenzene 0.04
    dibromomethane 0.42
    1,1,2,2-tetrachloroethane 0.28
    2-methyl-cyclohexyl acetate 0.1
    tetrabutyl urea 0.14
    diisobutyl methanol 0.05
    2-phenylethanol 0.08
    styrene 0.05
    dioctyl adipate 0.26
    dimethyl sulfate 0.04
    ethyl butyrate 0.09
    methyl lactate 0.03
    butyl lactate 0.14
    diethyl carbonate 0.07
    propanediol butyl ether 0.18
    triethyl orthoformate 0.14
    p-tert-butyltoluene 0.05
    methyl 4-tert-butylbenzoate 0.27
    morpholine 0.08
    tert-butylamine 0.01
    n-dodecanol 0.06
    dimethoxymethane 0.06
    ethylene carbonate 0.03
    cyrene 0.16
    2-ethoxyethyl acetate 0.3
    2-ethylhexyl acetate 0.08
    1,2,4-trichlorobenzene 0.05
    4-methylpyridine 0.05
    dibutyl ether 0.22
    2,6-dimethyl-4-heptanol 0.05
    DEF 0.04
    dimethyl isosorbide 0.59
    tetrachloroethylene 0.2
    eugenol 0.31
    triacetin 0.23
    span 80 0.35
    1,4-butanediol 0.02
    1,1-dichloroethane 0.06
    2-methyl-1-pentanol 0.09
    methyl formate 0.02
    2-methyl-1-butanol 0.06
    n-decane 0.03
    butyronitrile 0.03
    3,7-dimethyl-1-octanol 0.11
    1-chlorooctane 0.09
    1-chlorotetradecane 0.04
    n-nonane 0.02
    undecane 0.02
    tert-butylcyclohexane 0.01
    cyclooctane 0.01
    cyclopentanol 0.02
    tetrahydropyran 0.07
    tert-amyl methyl ether 0.08
    2,5,8-trioxanonane 0.92
    1-hexene 0.04
    2-isopropoxyethanol 0.11
    2,2,2-trifluoroethanol 0.02
    methyl butyrate 0.05

    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