2-Methyl-4-chlorophenoxyacetic acid CAS 94-74-6
Introduction：Basic information about 2-Methyl-4-chlorophenoxyacetic acid CAS 94-74-6, including its chemical name, molecular formula, synonyms, physicochemical properties, and safety information, etc.
2-Methyl-4-chlorophenoxyacetic acid Basic information
| Product Name: | 2-Methyl-4-chlorophenoxyacetic acid |
| Synonyms: | (4-CHLORO-O-TOLYOXY)ACETICACID;4-CHLORO-2-METHYLCHLOROPHENOXYACETICACID;2-Methyl-4-chlorphenoxyessigsure;Atlas MCPA;banleneplus;banvelm;basagran-m;BH MCPA |
| CAS: | 94-74-6 |
| MF: | C9H9ClO3 |
| MW: | 200.62 |
| EINECS: | 202-360-6 |
| Product Categories: | Stain Blocker;HERBICIDE;Building Blocks;C9;Carbonyl Compounds;Carboxylic Acids;Chemical Synthesis;Organic Building Blocks;Agro-Products;Aromatics;Isotope Labelled Compounds;OLED |
| Mol File: | 94-74-6.mol |
2-Methyl-4-chlorophenoxyacetic acid Chemical Properties
| Melting point | 114-118 °C (lit.) |
| Boiling point | 288.02°C (rough estimate) |
| density | 1.2799 (rough estimate) |
| refractive index | 1.5230 (estimate) |
| Fp | 2 °C |
| storage temp. | Sealed in dry,Room Temperature |
| solubility | water: insoluble(lit.) |
| form | Solid |
| pka | 3.14±0.10(Predicted) |
| color | White to Light yellow to Light orange |
| Water Solubility | 1.174g/L(25 ºC) |
| Merck | 14,5764 |
| BRN | 2051752 |
| InChI | 1S/C9H9ClO3/c1-6-4-7(10)2-3-8(6)13-5-9(11)12/h2-4H,5H2,1H3,(H,11,12) |
| InChIKey | WHKUVVPPKQRRBV-UHFFFAOYSA-N |
| SMILES | Cc1cc(Cl)ccc1OCC(O)=O |
| CAS DataBase Reference | 94-74-6(CAS DataBase Reference) |
| NIST Chemistry Reference | [(4-Chloro-o-tolyl)oxy]acetic acid(94-74-6) |
| EPA Substance Registry System | MCPA (94-74-6) |
Safety Information
| Hazard Codes | Xn,F,N |
| Risk Statements | 22-38-41-36-20/21/22-11-50/53 |
| Safety Statements | 26-37-39-36-16-61-60-36/37 |
| RIDADR | UN 2765 |
| WGK Germany | 2 |
| RTECS | AG1575000 |
| TSCA | TSCA listed |
| HazardClass | 9 |
| PackingGroup | III |
| HS Code | 29189900 |
| Storage Class | 11 - Combustible Solids |
| Hazard Classifications | Acute Tox. 4 Oral Aquatic Acute 1 Aquatic Chronic 1 Eye Dam. 1 Skin Irrit. 2 |
| Hazardous Substances Data | 94-74-6(Hazardous Substances Data) |
| Toxicity | LD50 orally in rats: 700 mg/kg (Rowe, Hymas) |
| Description | MCPA is a colorless crystalline solid. Molecular weight= 200.63; Freezing/Melting point=118.8℃; Vapor pressure= 1.5×106 mmHg at 20℃. Insoluble in water. |
| Chemical Properties | White, crystalline solid. Free acid insoluble in water but sodium and aminesalts are soluble. |
| Chemical Properties | MCPA is a colorless crystalline solid |
| Uses | Systemic postemergence herbicide used to control annual and perennial weeds incereals, rice, flax, vines, peas, potatoes, asparagus, grassland and turf. |
| Uses | (4-Chloro-2-methylphenoxy)acetic Acid is a herbicide.Environmental toxin on US EPA Toxic Release Inventory list (TRI) list. |
| Uses | Labelled MCPA (C369470). Herbicide. |
| Definition | ChEBI: A chlorophenoxyacetic acid that is (4-chlorophenoxy)acetic acid substituted by a methyl group at position 2. |
| General Description | Colorless plates. Corrosive. Practically insoluble in water. Used as an herbicide. |
| Air & Water Reactions | Insoluble in water. |
| Reactivity Profile | 2-Methyl-4-chlorophenoxyacetic acid is a chlorinated benzoic acid derivative. Reacts as a weak acid to neutralize bases, both organic (for example, the amines) and inorganic. May corrode iron, steel, and aluminum parts and containers if moist. Reacts with cyanide salts in the presence of moisture to generate gaseous hydrogen cyanide. May react if moist with sulfites, nitrites, thiosulfates (to give H2S and SO3), dithionites (SO2), to generate flammable and/or toxic gases and heat. Can be oxidized by strong oxidizing agents and reduced by strong reducing agents. These reactions generate heat. A variety of products is possible. Like other acids, may initiate polymerization reactions or catalyze other reactions. is a chlorinated carboxylic acid herbicide. Carboxylic acids donate hydrogen ions if a base is present to accept them. They react in this way with all bases, both organic (for example, the amines) and inorganic. Their reactions with bases, called "neutralizations", are accompanied by the evolution of substantial amounts of heat. Neutralization between an acid and a base produces water plus a salt. Carboxylic acids with six or fewer carbon atoms are freely or moderately soluble in water. Soluble carboxylic acid dissociate to an extent in water to yield hydrogen ions. The pH of solutions of carboxylic acids is therefore less than 7.0. Carboxylic acids in aqueous solution and liquid or molten carboxylic acids can react with active metals to form gaseous hydrogen and a metal salt. Such reactions occur in principle for solid carboxylic acids as well, but are slow if the solid acid remains dry. Even "insoluble" carboxylic acids may absorb enough water from the air and dissolve sufficiently in 2-Methyl-4-chlorophenoxyacetic acid to corrode or dissolve iron, steel, and aluminum parts and containers. Carboxylic acids, like other acids, react with cyanide salts to generate gaseous hydrogen cyanide. The reaction is slower for dry, solid carboxylic acids. Insoluble carboxylic acids react with solutions of cyanides to cause the release of gaseous hydrogen cyanide. Flammable and/or toxic gases and heat are generated by the reaction of carboxylic acids with diazo compounds, dithiocarbamates, isocyanates, mercaptans, nitrides, and sulfides. Carboxylic acids, especially in aqueous solution, also react with sulfites, nitrites, thiosulfates (to give H2S and SO3), dithionites (SO2), to generate flammable and/or toxic gases and heat. Their reaction with carbonates and bicarbonates generates a harmless gas (carbon dioxide) but still heat. Like other organic compounds, carboxylic acids can be oxidized by strong oxidizing agents and reduced by strong reducing agents. These reactions generate heat. A wide variety of products is possible. Like other acids, carboxylic acids may initiate polymerization reactions; like other acids, they often catalyze (increase the rate of) chemical reactions. |
| Agricultural Uses | Herbicide: A U.S. EPA restricted Use Pesticide (RUP) as MCPA,sodium salt. MCPA is a systemic post-emergence phenoxyherbicide used to control broadleaf annual and perennialweeds (including thistle and dock) in cereals, flax, rice,vines, peas, potatoes, grasslands, forestry applications,and on rights-of-way. It is very compatible with manyother compounds and may be used in formulation withmany other products, including bentazone, bromoxynil,2,4-D, dicamba, fenoxaprop, MCPB, mecoprop, thifensulfuron,and tribenuron. |
| Trade name | ACME MCPA AMINE 4®; AGRITOX®;AGROXONE®; AGROZONE®; AGSCO®; ANICONKOMBI®; ANICON M®; BANLENE®; BLESEL MC®;BORDERMASTER®; BROMINAL M & PLUS®;CAMBILENE®; CHEYENNE®; CHIMAC OXY®;CHIPTOX®; CHWASTOX®; CORNOX M®; DAKOTA®;DED WEED®; DICOPUR-M®; DICOTEX®; DOWMCP AMINE WEED KILLER®; DYVEL®; EH1356HERBICIDE®; EMCEPAN®; EMPAL®; ENVOY®;HEDAPUR M 52®; HEDAREX M®; HEDONAL M®;HERBICIDE M®; HORMOTUHO®; HORNOTUHO®;KILSEM®; 4 K-2 M®; KVK®; LEGUMEX DB®;LEUNA M®; LEYSPRAY®; LINORMONE®;M 40®; 2 M-4C®; 2 M-4KH®; MALERBANE®;MAYCLENE®; MEPHANAC®; MIDOX®; MXL®;OKULTIN®; PHENOXYLENE 50®; PHENOXYLENEPLUS®; PHENOXYLENE SUPER®; RAZOL DOCKKILLER®; RHOMENE®; RHONOX®; SHAMOX®;B-SELEKTONON M®; SEPPIC MMD®; TILLER®;TRIMEC®; U 46®; VACATE®; VESAKONTUHO®;WEEDAR®; WEEDAR MCPA CONCENTRATE®;WEEDONE MCPA ESTER®; WEED RHAP®; ZELAN® |
| Safety Profile | Suspected carcinogen. Poison by subcutaneous and intravenous routes. Moderately toxic by ingestion. Human systemic effects by ingestion: blood pressure decrease and coma. Experimental teratogenic and reproductive effects. Mutation data reported. An herbicide. When heated to decomposition it emits toxic fumes of Cl-. |
| Synthesis | 1878-49-5 94-74-6 (1) Assemble the microchannel continuous flow reactor according to Figure 1. The temperature of the recirculation system was set to 75°C according to the reaction temperature. After the microchannel reactor reached temperature equilibrium, 2-(o-toluyloxy)acetic acid was dissolved in chlorobenzene to prepare a chlorobenzene solution with a mass fraction of 20%. (2) Adjusting the flow rate of each raw material metering pump and controlling the molar ratio of 2-(o-toluyloxy)acetic acid, chlorine gas and hydrogen peroxide to be 1:0.55:0.4. The specific operation was as follows: the chlorobenzene solution of 2-(o-toluyloxy)acetic acid was fed with a mass flow rate of 150 mL/min (165 g/min), the chlorine gas was fed with a flow rate of 2.58 mL/min, and the 30% hydrogen peroxide aqueous solution was fed at a flow rate of 8 mL/min. (3) A chlorobenzene solution of 2-(o-toluoxy)acetic acid was injected into the preheating module A. Chlorine gas and hydrogen peroxide were introduced directly into modules B and D, respectively. module C was the chlorination reaction module, and modules D, E, and F were the secondary chlorination modules. (4) The mixture flowing out of the reactor outlet is directly introduced into a collector equipped with cooling water for cooling, and the resulting solution containing 2-methyl-4-chlorophenoxyacetic acid is yellow in chlorobenzene and dilute hydrochloric acid, and the mixture is gradually collected. (5) The mixture was layered and the organic phase was concentrated under reduced pressure to give 3154 g of 2-methyl-4-chlorophenoxyacetic acid with an HPLC purity of 97% and a yield of 98% (calculated based on stepwise addition of 2-(o-toluoxy)acetic acid). |
| Potential Exposure | A potential danger to those involvedin the manufacture, formulation, and application of thispostemergence herbicide, used for control of broadleafweeds in agricultural applications. |
| First aid | If this chemical gets into the eyes, remove anycontact lenses at once and irrigate immediately for at least 15 min, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts the skin, remove contaminated clothing and wash immediately with soap and water. Seek medical attention immediately. If this chemical has been inhaled, remove from exposure, begin rescue breathing (using universal precautions, including resuscitation mask) if breathing has stopped and CPR if heart action has stopped. Transfer promptly to a medical facility. When this chemical has been swallowed, get medical attention. Give large quantities of water and induce vomiting. Do not make an unconscious person vomit. |
| Environmental Fate | Biological. Cell-free extracts isolated from Pseudomonas sp. in a basal salt mediumdegraded MCPA to 4-chloro-o-cresol and glyoxylic acid (Gamar and Gaunt, 1971). Soil. Residual activity in soil is limited to approximately 3–4 months (Hartley andKidd, 1987). Plant. The penetration, translocation and metabolism of radiolabeled MCPA in acornland weed (Galium aparine) was studied by Leafe (1962). Carbon dioxide was identifiedas a metabolite but this could only account 7% of the applied MCPA. Though no Photolytic. When MCPA in dilute aqueous solution was exposed to summer sunlightor an indoor photoreactor (l >290 nm), 2-methyl-4-chlorophenol formed as the majorproduct as well as o-cresol and 4-chloro-2-formylphenol (Soderquist and Crosby, 1975).Clapés et al. (1986) studied the photodecomposition of aqueous solution of MCPA (120ppm, pH 5.4, 25°C) in a photoreactor equipped with a high pressure mercury lamp. After three minutes of irradiation, 4-chloro-2-methylphenol formed as an intermediate whichdegraded to 2-methylphenol. Both compounds were not detected after 6 minutes of irradiation;however, 1,4-dihydroxy-2-methylbenzene and 2-methyl-2,5-cyclohexadiene-1,4-dione formed as major and minor photodecomposition products, respectively. The sameexperiment was conducted using simulated sunlight (l <300 nm) in the presence ofriboflavin, a known photosensitizer. 4-Chloro-2-methylphenol and 4-chloro-2-methylbenzylformate formed as major and minor photoproducts, respectively (Clapés et al., 1986).Ozone degraded MCPA in dilute aqueous solution with and without UV light (l >300nm) (Benoit-Guyod et al., 1986). Chemical/Physical. Reacts with alkalies forming water soluble salts (Hartley and Kidd,1987). Ozonolysis of MCPA in the dark yielded the following benzenoid intermediates:4-chloro-2-methylphenol, its formate ester, 5-chlorosalicyaldehyde, 5-chlo |
| storage | Color Code—Blue: Health Hazard/Poison: Store in a secure poison location. Prior to working with this chemical you should be trained on its proper handling and storage. Store in tightly closed containers in a cool, wellventilated area. A regulated, marked area should be established where this chemical is handled, used, or stored in compliance with OSHA Standard 1910.1045. |
| Shipping | UN3345 Phenoxyacetic acid derivative pesticide,solid, toxic, Hazard Class: 6.1; Labels: 6.1-Poisonous materials. UN3077 Environmentally hazardous substances, solid,n.o.s., Hazard class: 9; Labels: 9-Miscellaneous hazardousmaterial, Technical Name Required |
| Purification Methods | It is insoluble in H2O (solubility is 0.55g/L at 20o) and recrystallises from *C6H6 or chlorobenzene as plates [J.nsson et al. Acta Chem Scand 6 993 1952]. The S-benzylisothiouronium salt has m 164-165o, and the Cu2+ salt has m 247-249o(dec) [Armarego et al. Nature 183 1176 1959, UV: Duvaux & Grabe Acta Chem Scand 4 806 1950, IR: J.berg Acta Chem Scand 4 798 1950]. [Beilstein 6 IV 1991.] It is a plant growth substance and a herbicide. |
| Incompatibilities | A weak acid. Compounds of the carboxyl group react with all bases, both inorganic andorganic (i.e., amines) releasing substantial heat, water and asalt that may be harmful. Incompatible with arsenic compounds (releases hydrogen cyanide gas), diazo compounds,dithiocarbamates, isocyanates, mercaptans, nitrides, andsulfides (releasing heat, toxic, and possibly flammablegases), thiosulfates and dithionites (releasing hydrogensulfate and oxides of sulfur). Incompatible with alkalis. |
| Waste Disposal | Incineration with added flammable solvent; incinerator equipped with fume scrubber.In accordance with 40CFR165, follow recommendationsfor the disposal of pesticides and pesticide containers.Must be disposed properly by following package labeldirections or by contacting your local or federal environmental control agency, or by contacting your regionalEPA office |
| References | [1] Russian Journal of Organic Chemistry, 2014, vol. 50, # 12, p. 1763 - 1766 [2] Zhurnal Organicheskoi Khimii, 2014, vol. 50, # 12, p. 1782 - 1785,4 [3] Patent: CN107488108, 2017, A. Location in patent: Paragraph 0038; 0039; 0040; 0041; 0042; 0043 [4] Patent: CN107698440, 2018, A. Location in patent: Paragraph 0018; 0022; 0023; 0024; 0025-0029; 0030; 0033-0037 [5] Patent: US2766279, 1954, |
2-Methyl-4-chlorophenoxyacetic acid Preparation Products And Raw materials
| Raw materials | Phenol-->Chloroacetic acid-->o-Cresol-->4-Chloro-2-methylphenol-->(2-METHYLPHENOXY)ACETIC ACID-->2-(2-Methylphenoxy)ethanol-->Ethyl chloroacetate-->Hydrogen peroxide-->Chlorobenzene |
| Preparation Products | (2-METHYLPHENOXY)ACETIC ACID |
