19666-30-9

Crystalline solid. Used as an herbicide.

OXYDIAZON(19666-30-9) is a diazo compound. Azo, diazo, azido compounds can detonate. This applies in particular to organic azides that have been sensitized by the addition of metal salts or strong acids. Toxic gases are formed by mixing materials of this class with acids, aldehydes, amides, carbamates, cyanides, inorganic fluorides, halogenated organics, isocyanates, ketones, metals, nitrides, peroxides, phenols, epoxides, acyl halides, and strong oxidizing or reducing agents. Flammable gases are formed by mixing materials in this group with alkali metals. Explosive combination can occur with strong oxidizing agents, metal salts, peroxides, and sulfides.

Dust may form an explosive mixture in air.

An oxadiazolinone/oxidiazole preemergence and early postemergence herbicide used to control annual grasses, sedges, and broadleaf weeds. Originally registered for use on turf and ornamentals; has wide use on golf courses.

If this chemical gets into the eyes, remove any contact lenses at once and irrigate immediately for at least 15 minutes, 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) 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. Do not induce vomiting when formulations containing petroleum solvents are ingested

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

Dust may form explosive mixture in air. Diazo compounds can detonate. This applies in particular to organic azides that have been sensitized by the addition of metal salts or strong acids. Toxic gases are formed by mixing materials of this class with acids, aldehydes, amides, carbamates, cyanides, inorganic fluorides, halogenated organics, isocyanates, ketones, metals, nitrides, peroxides, phenols, epoxides, acyl halides, and strong oxidizing or reducing agents. Flammable gases are formed by mixing materials in this group with alkali metals. Explosive combination can occur with strong oxidizing agents, metal salts, peroxides, and sulfides. This chemical is sensitive to prolonged exposure to heat. This chemical is incompatible with strong oxidizing agents.

Colorless crystalline solid. Odorless.

Pale Yellow Solid

It is the responsibility of chemical waste generators to determine the toxicity and physical properties and of a discarded chemical and to properly identify its classification and certification as a hazardous waste, and to determine the disposal method. United States Environmental Protection Agency guidelines for the classification determination are listed in 40 CFR Parts 261.3. Additionally, waste generators must consult and follow all regional, national, state, and local hazardous waste laws to ensure complete and accurate classification and disposal methods. Follow recommendations for the disposal of pesticides and pesticide containers. Containers must be disposed of properly by following package label directions or by contacting your local or federal environmental control agency, or by contacting your regional EPA office.
Do not discharge into drains or sewers. Dispose of waste material as hazardous waste using a licensed disposal contractor to an approved landfill. Consult with environmental regulatory agencies for guidance on acceptable disposal practices. If allowed, incineration with effluent gas scrubbing is recommended. Containers must be disposed of properly by following package label directions or by contacting your local or federal environment

A commonly used herbicide/pesticide.

Herbicide.

Preemergence herbicide used for controlling certain annual grasses (e.g., bluegrass, barnyardgrass, crabgrass, goosegrass, sprangletop) and broad-leaved weeds (e.g., cudweed, dayflower, filaree, groundsel, jimsonweed, morningglory, mustards, pigweed, redmaids, smartweed, sowthistle, velvetleaf) in turf, lawns, orchards and ornamentals.

ChEBI: Oxadiazon is an aromatic ether.

CARPETMAKER®; CHIP SHOT®[C]; GOLD KIST®; PAR EX®; PRO GROW®; REGAL O-O®; REGALSTAR®; RONSTAR®; RP-17623®; TURFIC®; VERTAGREEN®; WILBRO

Selective with contact action. Inhibits protoporphyrinogen oxidase, leading to irreversible cell membrane damage.

Moderately toxic by ingestion, inhalation, and skin contact. When heated to decomposition it emits toxic vapors of NOx and Clí.

To a 20 mL autoclave was added a stirrer, 0.2 mmol of pivaloyl chloride-2,4-dichloro-5-isopropoxyphenylhydrazone, 0.5 mmol of cesium fluoride, 0.24 mmol of 18-crown-6 and 2 mL of toluene. Carbon dioxide was passed until the pressure reached 2.0 MPa, and the reaction was stirred at 25°C for 24 hours. After the reaction was completed, the heating and stirring were stopped, and the unreacted carbon dioxide was slowly released after the system was cooled to room temperature. The reaction solution was transferred to a partition funnel, 15 mL of water was added and extracted three times with 15 mL of ethyl acetate. The organic phases were combined and washed sequentially with water and saturated saline. The organic phase was dried over anhydrous sodium sulfate and concentrated under reduced pressure to remove the solvent to obtain the crude product. The crude product was purified by column chromatography with the eluent of petroleum ether and ethyl acetate (30:1, v/v) to afford the target product 5-(tert-butyl)-3-(2,4-dichloro-5-isopropoxyphenyl)-1,3,4-oxadiazol-2(3H)-one in 88% yield.

Soil. The reported half-life in soil is approximately 3–6 months (Hartley and Kidd, 1987). Oxadiazon degraded slowly in both moist and flooded soils. After 25 weeks, only 0.1–3.5% degraded to carbon dioxide and 0.5–1.1% as volatile products. Metabolites identified included oxadiazonphenol, oxadiazon acid and methoxyoxadiazon (Ambrosi et al., 1977).
Plant. Reported half-lives of oxadiazon in rice and orchard fruit are 1–2 and 3–6 months, respectively (Hartley and Kidd, 1987).

This inhalation potency results in an IRSL of 0.05 μg/m3 with annual averaging.

[1] Journal of Organic Chemistry, 2017, vol. 82, # 14, p. 7637 - 7642
[2] Patent: CN106866573, 2017, A. Location in patent: Paragraph 0073; 0074; 0075; 0076; 0077; 0078

Herbicide