2-(3,4-dichlorophenyl)-4-methyl-1,2,4-oxadiazolidinedione

Description

2-(3,4-dichlorophenyl)-4-methyl-1,2,4-oxadiazolidinedione · CAS 20354-26-1 · C9H6Cl2N2O3. UNII E35M7EMD3V. Melting Point: 123-124 °C; Density: 1.24 at 25 °C; Vapor Pressure: 0.000001 [mmHg].

Identification

Computed Descriptors

Physical & Chemical Properties

Physical description & handling notes

• Methazole appears as colorless crystals to light tan solid. Non corrosive. Herbicide.
• White solid; Technical material: Light tan solid; [HSDB]
• White solid
• Decomposes before boiling
• @ 25 °C: 1.5 MG/L WATER, 40 G/L ACETONE, 6.5 G/L METHANOL, 55 G/L XYLENE
• @ 25 °C in ethanol approx equal to 1.0% wt/wt

GHS Hazard Classification

Documented Uses

• Used as pre- and post-emergence herbicide for control of annual broad-leaved weeds and some grasses in cotton, onions, potatoes, citrus and stone fruit, vines, lucerne, tea, and nuts; [HSDB]
• Pre- and post-emergence control of annual broad-leaved weeds and some grasses incotton, garlic, onions, potatoes, citrus fruit, stone fruit, vines, lucerne, tea, and nut crops.
• PRODUCED BY CYCLIZATION, WITH A HALOFORMATE, OF 1-(3,4-DICHLOROPHENYL)-1-HYDROXY-3-METHYLUREA, WHICH IS FORMED BY REACTION OF N-(3,4-DICHLOROPHENYL)HYDROXYLAMINE WITH METHYL ISOCYANATE.
• METHAZOLE APPEARS TO BE A PROHERBICIDE WHILE DIURON & LINURON ACT DIRECTLY & VIA METABOLITES AS PHOTOSYNTHETIC INHIBITORS.
• It is a selective herbicide effective against certain grasses and many broad-leaved weeds: pre-emergence in garlic and potatoes (1-2 kg ai/ha); as a directed spray on soil or emerged weeds in citrus, stone-fruits, nuts, tea and established vines (6 kg/ha) and on cotton 15 cm tall (1-2 kg/ha), onions (>2 leaves) (2.5 kg/ha), newly seeded or winter-dormant lucerne (>1 yr old) (2.25 kg/ha). It is preferably applied to moist soil; lower rates are applicable to light sandy soils.
• LITTLE OR NO INTACT HERBICIDE WAS TRANSLOCATED FROM ROOTS TO LEAVES BUT RADIOACTIVITY IN LEAVES ACCOUNTED FOR 80-90% OF METHANOL-SOLUBLE LABEL @ 47 DAYS POSTTREATMENT. MOST OF THIS (14)C WAS RECOVERED AS DCPU /1-(3,4-DICHLOROPHENYL)UREA/ (50-60%) & UNIDENTIFIED POLAR METABOLITE (30-40%).

Synonyms

Methazole; 20354-26-1; Metazole; Oxydiazol; Bioxone; Paxilon; Tunic; Metazol; Mezopur; CHLORMETHAZOLE; 2-(3,4-Dichlorophenyl)-4-methyl-1,2,4-oxadiazolidine-3,5-dione; Probe 75; VCS 438; E35M7EMD3V; DTXSID1040293; RefChem:811715

Frequently Asked Questions

What are the CAS number and molecular formula of 2-(3,4-dichlorophenyl)-4-methyl-1,2,4-oxadiazolidinedione?

CAS 20354-26-1; molecular formula C9H6Cl2N2O3; molecular weight — g/mol.

What other names is 2-(3,4-dichlorophenyl)-4-methyl-1,2,4-oxadiazolidinedione known by?

Methazole, 20354-26-1, Metazole, Oxydiazol, Bioxone, Paxilon.

Is 2-(3,4-dichlorophenyl)-4-methyl-1,2,4-oxadiazolidinedione classified as hazardous?

Hazard statements reported: H302, H312, H315, H319, H411.

What are the key physical properties of 2-(3,4-dichlorophenyl)-4-methyl-1,2,4-oxadiazolidinedione?

Melting Point: 123-124 °C; Density: 1.24 at 25 °C; Vapor Pressure: 0.000001 [mmHg]; Vapor Pressure: 133 uPa at 25 °C.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.