1861-32-1

Hazards Identification

GHS Hazard Statements:

Not Classified
Reported as not meeting GHS hazard criteria by 4 of 4 companies. For more detailed information, please visit ECHA C&L website.

Hazards Summary:

Because it is a possible carcinogen, mixers, loaders, and applicators using DCPA wettable powder are required to wear dust-mist respirators; [Reference #1]

Usage

Uses

Used in Agriculture:
Dacthal is used as a pre-emergent herbicide for controlling most annual grasses and many broad-leaved weeds. It is particularly effective in preventing the growth of unwanted plants before they emerge, thus reducing the need for post-emergent treatments and minimizing the impact on the environment.
Used in Pre-emergent Herbicide Applications:
Dacthal is employed as a pre-emergent herbicide to manage the growth of various types of weeds and grasses. Its selective nature allows it to target specific plants without causing harm to the desired vegetation, making it a valuable tool in agricultural and horticultural settings.
Used in Environmental Management:
Due to its effectiveness in controlling the growth of unwanted plants, Dacthal is also used in environmental management applications. It helps maintain the balance of ecosystems by preventing the overgrowth of invasive species and preserving the natural habitats of native plants and animals.

Potential Exposure

DCPA is an alkyl phthalate; benzene- dicarboxylic acid herbicide, pesticide pre-emergent herbi- cide is used on annual broadleaf weeds and grasses in a wide spectrum of vegetable crops.

Environmental Fate

Soil. Bartha and Pramer (1967) reported that DCPA was degraded by soil microorganisms via cleavage of the herbicide molecule into propionic acid and 3,4-dichloroaniline. The acid was mineralized to carbon dioxide and water and two molecules of 3,4-dichloroaniline were condensed to form 3,3′4,4′-tetrachloro-azobenzene. Metabolites identified in soil and turfgrass thatch are monomethyl tetrachloroterephthalate and 2,3,5,6-tetrachloroterephthalic acid (Hartley and Kidd, 1987; Krause and Niemczyk, 1990). Residual activity in soil and the half-life in soil were reported to be approximately 3 months (Hartley and Kidd, 1987; Worthing and Hance, 1991)

Shipping

UN3077 Environmentally hazardous substances, solid, n.o.s., Hazard class: 9; Labels: 9-Miscellaneous hazardous material, Technical Name Required.

Incompatibilities

May react violently with strong oxidi- zers, bromine, 90% hydrogen peroxide, phosphorus trichloride, silver powders or dust. Incompatible with silver compounds. Mixture with some silver compounds forms explosive salts of silver oxalate.

Waste Disposal

Incineration in a unit with efficient gas scrubbing. Containers must be disposed of properly by following package label directions or by con- tacting your local or federal environmental control agency, or by contacting your regional EPA office.

InChI:InChI=1/C10H6Cl4O4/c1-17-9(15)3-5(11)7(13)4(10(16)18-2)8(14)6(3)12/h1-2H3

Upstream product

• 67-56-1 methanol 
• 719-32-4 tetrachloroterephthaloyl dichloride 
• 120-61-6 1,4-benzenedicarboxylic acid dimethyl ester 
• 13376-62-0 N-(4-methoxycarbonyl)-2,3,5,6-tetrachlorobenzoyl chloride 
• 1786-85-2 2,3,5,6-tetrachloro-1,4-benzenecarboxamide 
• 1897-41-2 2,3,5,6-tetrachloroterephthalonitrile 
• 2136-79-0 Dactal 
• 77-78-1 dimethyl sulfate 
• 100-20-9 terephthaloyl chloride 

Downstream Products

• 727-55-9 dimethyl 2,3,5,6-tetrafluoroterephthalate 
• 7154-26-9 2,3,5,6-Tetrachloroxylylene-α,α'-diol 

Relevant academic research and scientific papers

2, 3, 5, 6 - Tetrachloro - 1, 4 - benzenedicarboxylic acid dimethyl manufacturing method

2, 3, 5, 6 - Tetrachloro - 1, 4 - benzenedicarboxylic acid dimethyl [to] horticultural herbicide useful in manufacturing, compared with conventional methods such as reducing environmentally harmful byproducts of hexachlorobenzene penta- chlorobenzene or content, can be efficiently manufactured in an industrial method. (I) formula [a]The manufacturing method of the compound represented, 2, 3, 5, 6 - tetrachloro - 1, 4 - benzenedicarboxylic acid (a), a ketone-based solvent in the presence of a hydrous alkali carbonate, prepared by reacting dimethyl sulfate, formula (I) compounds represented by the process to obtain the crystal, and (b) the crystal was washed with warm water of 30 a-°C 100, then further washed with an organic solvent comprising 30 a-°C 80, said method. [Drawing] no

ALKALI METAL FLUORIDE DISPERSION AND PROCESS FOR PRODUCING FLUORINE-CONTAINING ORGANIC COMPOUND USING THE SAME

An alkali metal fluoride dispersion essentially consisting of an alkali metal fluoride and an aprotic organic solvent obtainable by conducting the following Step (A), subsequently conducting the following Step (B) at least once, and then conducting the following Step(C); Step (A): a step of separating a liquid phase from an alkali metal fluoride dispersion comprising at least one alcohol solvent selected from the group consisting of methanol, ethanol and isopropanol and an alkali metal fluoride, and mixing the separated liquid phase with an aprotic organic solvent having a boiling point of 85° C. or higher at normal pressure to obtain a mixture containing the alkali metal fluoride; Step (B): a step of obtaining a mixture containing the alkali metal fluoride comprising the following Steps (b1) to (b3); Step (b1): a step of concentrating the mixture containing the alkali metal fluoride obtained in Step (A) or Step (b3) to obtain a concentrated fraction and a concentrated residue; Step (b2): a step of mixing a residue of the alkali metal fluoride dispersion obtained by separating the liquid phase in Step (A) or a residue of the mixture obtained by separating a liquid phase in Step (b3) with the concentrated fraction obtained in Step (b1) to obtain a mixture containing an alkali metal fluoride; and Step (b3): a step of separating a liquid phase from the mixture containing an alkali metal fluoride obtained in Step (b2) and mixing the separated liquid phase with the concentrated residue obtained in Step (b1) to obtain a mixture containing an alkali metal fluoride; and Step (C): a step of removing the alcohol solvent from the mixture containing the alkali metal fluoride, which is obtained in Step (B), to obtain the alkali metal fluoride dispersion essentially consisting of the alkali metal fluoride and the aprotic organic solvent.

POTASSIUM FLUORIDE DISPERSION SOLUTION, AND PROCESS FOR PRODUCTION OF FLUORINATED ORGANIC COMPOUND USING THE SAME

A potassium fluoride dispersion essentially consisting of potassium fluoride and an aprotic organic solvent having a boiling point higher than that of methanol, which is obtainable by mixing a mixture containing potassium fluoride and 5 to 50 parts by weight of methanol per 1 part by weight of potassium fluoride with the aprotic organic solvent followed by concentrating the obtained mixture, and a process for producing a fluorine-containing organic compound comprising contacting an organic compound having at least one group capable of being substituted nucleophilically with a fluorine atom with the potassium fluoride dispersion.

METHOD FOR PRODUCING TETRAFLUOROTEREPHTHALIC ACID DIFLUORIDE

A method for producing tetrafluoroterephthalic acid difluoride comprising reacting tetrachloroterephthalic acid dichloride with potassium fluoride in the presence of dimethyl sulfone.

Study of the Kinetics and Mechanism of the Base-Catalyzed Esterification of Tetrachloroterephthaloyl Chloride with HPLC and Carbon-13 FT-NMR

The pyridine base-catalyzed esterification of tetrachloroterephthaloyl dichloride (R) with methanol was studied at room temperature and found to follow a four-step course; high-perfomance liquid chromatography (HPLC) was used to analyze and characterize intermediates in reaction mixtures.The reaction proceeds with the initial formation of a benzoylpyridinium ion (M) followed by formation of a terephthaloyl dipyridinium ion (N); both are strongly associated with the alcohol solvent molecules as indicated by chromatographic retention times.The pyridinium salts react with alcohol to form a monoester followed by product diester (P) at slower rates.The rate constants for each mechanistic step were obtained from batch reactor studies together with HPLC analysis; the rates for the first two consecutive steps were dependent on the organic base (pyridine and 4-picoline) catalyst concentration.Large, negative values of the entropy of activation were interpreted in terms of a highly ordered transition state in the course of formation of the ionic intermediates.The presence of alcohol was found to be important for the formation of the salts.Carbon-13 FT-NMR spectra of polychlorinated reaction intermediates were obtained at low temperature to enhance sensitivity; results supported conclusions regarding structures and reaction requirements.

5,6-Dihydro-1,2,4,6-thiatriazin-5-one-1,1-dioxides

5,6-Dihydro-1,2,4,6-thiatriazin-5-one-1,1-dioxides of the formula STR1 where R1 is hydrogen, a metal atom or an unsubstituted or substituted ammonium radical, R2 is a saturated or unsaturated straight-chain aliphatic radical of up to 10 carbon atoms, a cycloaliphatic radical or 3 to 7 carbon atoms, a branched saturated or unsaturated aliphatic radical of 3 to 10 carbon atoms, a halogen-, alkoxy- or alkylmercapto-substituted aliphatic radical of 2 to 10 carbon atoms tetrahydrofuryl substituted methyl, a cycloalkoxy-substituted aliphatic radical of 4 to 10 carbon atoms, unsubstituted or halogen-substituted benzyl or phenyl, halophenyl, or alkylphenyl of a total of up to 10 carbon atoms, R3 is hydrogen, a straight-chain aliphatic radical of up to 10 carbon atoms, a cycloaliphatic radical of 3 to 7 carbon atoms, a branched aliphatic radical of 3 to 10 carbon atoms, haloalkyl, or alkoxyalkyl of 2 to 10 carbon atoms and X is oxygen and may also be sulfur if R2 is unsubstituted or halogen-substituted benzyl, processes for their preparation, and herbicides containing the above compounds.

Diacylium complexes of tetrahaloterephthalic acid

Diacylium complexes of tetrahaloterephthalic acid can be produced by reacting tetrahaloterephthalic acid with sulfur trioxide to form compounds capable of reacting with various nucleophilics.