2,4-Dichlorophenoxyacetic Acid

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  • Identifiers

    CAS number
    94-75-7

    Molecular formula
    C8H6Cl2O3

    SMILES
    C1=CC(=C(C=C1Cl)Cl)OCC(=O)O

    Safety labels

    Corrosive
    Corrosive

    Irritant
    Irritant

  • Odor profile

    Fragrance
    Odorless 45.09%
    Sweet 29.47%
    Vanilla 26.98%
    Phenolic 26.25%
    Powdery 25.86%
    Milky 25.2%
    Creamy 24.75%
    Savory 24.23%
    Fatty 24.1%
    Musk 23.8%

     

    Flavor
    Odorless 53.47%
    Mild 44.73%
    Bitter 26.87%
    Very mild 25.69%
    Sour 25.29%
    Fruity 24.24%
    Bland 23.66%
    Phenolic 23.62%
    Sweet 23.39%
    Faint 22.7%

     

    Odor impact est.
    Low

    Odor threshold

    • Detection: 3.13 mg/kg

  • Properties

    XLogP3-AA
    2.8

    pKa est.
    6.92 (neutral)

    Molecular weight
    221.03 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Ultra slow

    Melting point expt.

    • 419 °F (decomposes) (NTP, 1992)
    • 280 °F (NTP, 1992)
    • 138 °C
    • 140.5 °C
    • 140 °C
    • 280 °F

    Boiling point

    • Decomposes (NTP, 1992)
    • BP: 160 °C at 4 mm Hg
    • No boiling point at normal pressure; decomposes on heating
    • decomposes
    • Decomposes

    Flash point

    • 167.96 ˚C est.

    Solubility expt.

    • Soluble (NTP, 1992)
    • Decomposes (NTP, 1992)
    • Needles from alcohol. Solubility in water: 3.5% /2,4-D, sodium salt/
    • In water, 677 ppm at 25 °C
    • In water, 540 ppm at 20 °C
    • Soluble in organic solvents
    • 67.3 g/400 mL acetone at 25 °C; 0.94 g/100 mL benzene at 28 °C; 0.63 g/100 mL carbon disulfide at 29 °C; 0.16 g/100 mL carbon tetrachloride at 25 °C; 0.08 g/100 mL diesel oil and kerosene at 25 °C; 78.5 g/100 mL dioxane at 31 °C; 10.3 g/100 mL ethanol (50%) at 25 °C; 100 g/100 mL ethyl alcohol (95%) at 25 °C; 27.0 g/100 mL ethyl ether at 25 °C; 24.8 g/100 mL isopropanol at 31 °C; 25 g/100 mL methyl isobutyl ketone at 25 °C; 0.52 g/100 mL ortho-dichlorobenzene at 25 °C; 0.058 g/100 mL toluene at 25 °C
    • In ethanol 1250, diethyl ether 243, heptane 1.1, toluene 6.7, xylene 5.8 (all in g/kg, 20 °C); in octanol 120 g/L (25 °C). Insoluble in petroleum oils
    • 0.677 mg/mL at 25 °C
    • Solubility in water, g/100ml at 25 °C: 0.031 (very poor)
    • 0.05%

  • Synonyms

    • 2,4-dichlorophenoxyacetic acid
    • 94-75-7
    • 2-(2,4-dichlorophenoxy)acetic acid
    • 2,4-D
    • (2,4-Dichlorophenoxy)acetic acid
    • Tributon
    • Weedone
    • Rhodia
    • 2,4-D acid
    • Weed-Rhap
    • Weedone lv4
    • Agrotect
    • Fernesta
    • Fernimine
    • Netagrone
    • Vergemaster
    • Amoxone
    • Dicopur
    • Dormone
    • Estone
    • Ipaner
    • Moxone
    • Phenox
    • Pielik
    • Weed-B-gon
    • Verton 2D
    • Brush-rhap
    • Crop rider
    • B-Selektonon
    • Pennamine D
    • Weed-ag-bar
    • Weedez wonder bar
    • Chloroxone
    • Herbidal
    • Planotox
    • Weedatul
    • Weedtrol
    • Ferxone
    • Miracle
    • Monosan
    • Ded-Weed LV-69
    • Emulsamine bk
    • Foredex 75
    • Vidon 638
    • Mota Maskros
    • Envert dt
    • Lawn-keep
    • Weed tox
    • Acetic acid, (2,4-dichlorophenoxy)-
    • Esteron 76 BE
    • Emulsamine E-3
    • Emulsamine
    • Macrondray
    • Croprider
    • Crotilin
    • Plantgard
    • Dormon
    • Moxon
    • Netagrone 600
    • Esteron 44 weed killer
    • Superormone concentre
    • Agricorn D
    • Debroussaillant 600
    • Silvaprop 1
    • Acme LV 4
    • Dacamine
    • Deherban
    • Desormone
    • Diclordon
    • Esterone
    • Fernoxone
    • Macondray
    • Pennamine
    • Barrage
    • Esteron
    • Weedar
    • Salvo
    • Verton 38
    • Rcra waste number U240
    • Weed-Rhap A-4
    • Weed-Rhap B-4
    • Citrus fix
    • Visko-rhap low drift herbicides
    • Caswell No. 315
    • Acme LV 6
    • Visko-rhap low volatile 4l
    • Tiller S
    • Weed-Rhap B-266
    • R-H Weed Rhap 20
    • Weed-Rhap LV-4-0
    • Hedonal, herbicide
    • Hedonal (the herbicide)
    • Aminopielik 50SL
    • Dichlorophenoxyacetic acid
    • Weed-Rhap I-3.34
    • Esteron 99
    • Formula 40
    • U 46DP
    • Dezormon
    • Huragan
    • Red Devil Dry Weed Killer
    • Hivol-44
    • Uniso
    • De-Pester Ded-Weed LV-2
    • Visko-rhap
    • Scott's 4-XD Weed Control
    • Acide 2,4-dichloro phenoxyacetique
    • CCRIS 949
    • (2,4-Dichlorophenyloxy)acetic acid
    • Phenoxyacetic acid, 2,4-dichloro-
    • Barrage HF
    • Verton D
    • Atlas D
    • HSDB 202
    • Vertron 2D
    • 2,4-Dwuchlorofenoksyoctowy kwas
    • Acme amine 4
    • 2,4-Dichlorophenoxyethanoic acid
    • (2,4-Dichloor-fenoxy)-azijnzuur
    • Esteron brush killer
    • Acme butyl ester 4
    • Verton 2-D
    • Weedar-64
    • (Dichlorophenoxy)acetic acid
    • BH 2,4-D
    • DMA-4
    • NSC 2925
    • (2,4-Dichlor-phenoxy)-essigsaeure

  • Applications

    2,4-Dichlorophenoxyacetic acid (CAS 94-75-7) is the active ingredient in selective post-emergence herbicides used to control broadleaf weeds. In agriculture, it targets broadleaf competitors in cereal crops and pastures while sparing grasses. In turf management and residential lawn care, it is formulated for selective weed suppression. It is also widely used in forestry and woodland management to reduce competition from broadleaf species during site establishment and maintenance. For rights-of-way and industrial vegetation control, it is applied to manage growth around infrastructure. In formulation practice, 2,4-Dichlorophenoxyacetic acid is supplied as salts or esters and is often combined in multi-ingredient herbicide products to broaden efficacy or spectrum. It may also serve as an intermediate or building block in the synthesis of related herbicides and plant-growth-regulating chemistries.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 567.57
    methanol 515.54
    isopropanol 286.5
    water 2.54
    ethyl acetate 229.73
    n-propanol 358.58
    acetone 498.75
    n-butanol 301.83
    acetonitrile 190.28
    DMF 884.0
    toluene 5.01
    isobutanol 198.88
    1,4-dioxane 485.43
    methyl acetate 310.53
    THF 1115.98
    2-butanone 379.14
    n-pentanol 286.38
    sec-butanol 268.5
    n-hexane 3.05
    ethylene glycol 140.3
    NMP 423.1
    cyclohexane 3.08
    DMSO 529.82
    n-butyl acetate 175.15
    n-octanol 88.22
    chloroform 14.69
    n-propyl acetate 215.15
    acetic acid 187.16
    dichloromethane 40.98
    cyclohexanone 198.79
    propylene glycol 120.68
    isopropyl acetate 134.98
    DMAc 795.95
    2-ethoxyethanol 719.57
    isopentanol 196.73
    n-heptane 12.79
    ethyl formate 146.11
    1,2-dichloroethane 50.13
    n-hexanol 128.62
    2-methoxyethanol 850.02
    isobutyl acetate 120.87
    tetrachloromethane 0.24
    n-pentyl acetate 108.68
    transcutol 781.05
    n-heptanol 74.21
    ethylbenzene 12.13
    MIBK 137.41
    2-propoxyethanol 343.77
    tert-butanol 302.36
    MTBE 268.94
    2-butoxyethanol 185.65
    propionic acid 113.79
    o-xylene 10.81
    formic acid 154.17
    diethyl ether 236.64
    m-xylene 8.64
    p-xylene 18.09
    chlorobenzene 11.72
    dimethyl carbonate 122.83
    n-octane 6.26
    formamide 323.92
    cyclopentanone 327.03
    2-pentanone 261.37
    anisole 121.55
    cyclopentyl methyl ether 196.24
    gamma-butyrolactone 345.67
    1-methoxy-2-propanol 530.23
    pyridine 103.12
    3-pentanone 169.02
    furfural 234.46
    n-dodecane 6.9
    diethylene glycol 316.78
    diisopropyl ether 47.5
    tert-amyl alcohol 259.07
    acetylacetone 227.29
    n-hexadecane 7.4
    acetophenone 118.73
    methyl propionate 210.18
    isopentyl acetate 142.99
    trichloroethylene 57.29
    n-nonanol 84.74
    cyclohexanol 117.56
    benzyl alcohol 114.49
    2-ethylhexanol 86.29
    isooctanol 64.36
    dipropyl ether 152.74
    1,2-dichlorobenzene 14.91
    ethyl lactate 115.47
    propylene carbonate 145.47
    n-methylformamide 377.1
    2-pentanol 176.17
    n-pentane 4.17
    1-propoxy-2-propanol 237.62
    1-methoxy-2-propyl acetate 210.68
    2-(2-methoxypropoxy) propanol 220.94
    mesitylene 9.18
    ε-caprolactone 200.28
    p-cymene 28.16
    epichlorohydrin 397.67
    1,1,1-trichloroethane 11.68
    2-aminoethanol 245.24
    morpholine-4-carbaldehyde 555.37
    sulfolane 252.98
    2,2,4-trimethylpentane 4.38
    2-methyltetrahydrofuran 454.34
    n-hexyl acetate 121.29
    isooctane 3.04
    2-(2-butoxyethoxy)ethanol 302.6
    sec-butyl acetate 132.68
    tert-butyl acetate 143.63
    decalin 4.12
    glycerin 173.3
    diglyme 504.01
    acrylic acid 93.39
    isopropyl myristate 70.99
    n-butyric acid 138.4
    acetyl acetate 89.86
    di(2-ethylhexyl) phthalate 58.73
    ethyl propionate 160.44
    nitromethane 373.93
    1,2-diethoxyethane 353.34
    benzonitrile 61.45
    trioctyl phosphate 47.19
    1-bromopropane 28.9
    gamma-valerolactone 444.25
    n-decanol 71.29
    triethyl phosphate 75.65
    4-methyl-2-pentanol 80.91
    propionitrile 132.8
    vinylene carbonate 107.94
    1,1,2-trichlorotrifluoroethane 158.49
    DMS 105.75
    cumene 15.64
    2-octanol 61.07
    2-hexanone 245.48
    octyl acetate 90.49
    limonene 44.87
    1,2-dimethoxyethane 843.7
    ethyl orthosilicate 75.26
    tributyl phosphate 57.5
    diacetone alcohol 215.33
    N,N-dimethylaniline 98.67
    acrylonitrile 134.83
    aniline 38.06
    1,3-propanediol 320.63
    bromobenzene 7.98
    dibromomethane 18.45
    1,1,2,2-tetrachloroethane 44.64
    2-methyl-cyclohexyl acetate 111.35
    tetrabutyl urea 108.01
    diisobutyl methanol 56.37
    2-phenylethanol 90.37
    styrene 14.28
    dioctyl adipate 108.31
    dimethyl sulfate 145.35
    ethyl butyrate 156.4
    methyl lactate 136.94
    butyl lactate 99.97
    diethyl carbonate 105.06
    propanediol butyl ether 173.46
    triethyl orthoformate 128.82
    p-tert-butyltoluene 28.06
    methyl 4-tert-butylbenzoate 119.69
    morpholine 652.62
    tert-butylamine 126.16
    n-dodecanol 58.11
    dimethoxymethane 623.54
    ethylene carbonate 96.54
    cyrene 213.87
    2-ethoxyethyl acetate 172.33
    2-ethylhexyl acetate 111.67
    1,2,4-trichlorobenzene 24.18
    4-methylpyridine 86.39
    dibutyl ether 126.98
    2,6-dimethyl-4-heptanol 56.37
    DEF 312.89
    dimethyl isosorbide 312.38
    tetrachloroethylene 15.79
    eugenol 129.74
    triacetin 133.67
    span 80 133.35
    1,4-butanediol 192.42
    1,1-dichloroethane 26.51
    2-methyl-1-pentanol 176.76
    methyl formate 275.75
    2-methyl-1-butanol 200.9
    n-decane 9.84
    butyronitrile 135.83
    3,7-dimethyl-1-octanol 82.7
    1-chlorooctane 35.58
    1-chlorotetradecane 18.13
    n-nonane 8.65
    undecane 8.13
    tert-butylcyclohexane 5.14
    cyclooctane 1.98
    cyclopentanol 199.72
    tetrahydropyran 294.95
    tert-amyl methyl ether 202.56
    2,5,8-trioxanonane 400.55
    1-hexene 23.31
    2-isopropoxyethanol 390.78
    2,2,2-trifluoroethanol 68.23
    methyl butyrate 214.0

    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