13-05990. Methazole [Archived]

Nomenclature

CAS number: 20354-26-1
2-(3,4-Dichlorophenyl)-4-methyl-1,2,4-oxadiazolidine-3,5-dione; oxydiazol; VCS-438; Paxilon (Fisons); Probe (Velsicol).
C9H6Cl2N2O3; mol wt 261.06.
C 41.41%, H 2.32%, Cl 27.16%, N 10.73%, O 18.39%.

Description and references

Pre- and post-emergence herbicide. Prepn: J. Krenzer, ZA 6701543; idem, US 3437664 (1968, 1969 to Velsicol). Metabolism: H. W. Dorough et al., Drug Metab. Dispos. 2, 129 (1974). Persistence in the soil: W. Bond, H. A. Roberts, Weed Res. 16, 23 (1976); A. Walker, Pestic. Sci. 9, 326 (1978). Mechanism of phytotoxicity: J. Verity et al., Weed Res. 21, 243, 307, 317 (1981). Acute toxicity: T. B. Gaines, R. E. Linder, Fundam. Appl. Toxicol. 7, 299 (1986).

Chemical structure

Properties

Light tan solid, mp 123-124°. Soly at 25°: water 1.5 ppm; xylene 55 g/l. LD50 in adult male, female rats (mg/kg): 777, 925 orally (Gaines, Linder).

Use

Herbicide.

Status

This monograph has been retired and is no longer subject to revision or update.