Title: Diclobutrazol
CAS Registry Number: 75736-33-3
CAS Name: (aR,bR)-rel-b-[(2,4-Dichlorophenyl)methyl]-a-(1,1-dimethylethyl)-1H-1,2,4-triazole-1-ethanol
Additional Names: 1-(2,4-dichlorophenyl)-4,4-dimethyl-2-(1,2,4-triazol-1-yl)pentan-3-ol; 1-t-butyl-2-(1,2,4-triazol-1-yl)-2-(2¢,4¢-dichlorobenzyl)ethanol; dichlobutrazol
Manufacturers' Codes: PP-296
Trademarks: Vigil (Zeneca)
Molecular Formula: C15H19Cl2N3O
Molecular Weight: 328.24
Percent Composition: C 54.89%, H 5.83%, Cl 21.60%, N 12.80%, O 4.87%
Literature References: Prepn: BE 857836; S. Balasubramanyan, M. C. Shephard, US 4243405 (1978, 1981 both to ICI). Activity, physical properties, and toxicity: K. J. Bent, A. M. Skidmore, Proc. Br. Crop Prot. Conf. - Pests Dis. 1979, 477. Fungicidal activity: B. Ram et al., Tests Agrochem. Cultiv. 3, 38 (1982). Regulation of plant growth: J. B. Shanks, Proc. Plant Growth Regul. Soc. Am. 9, 68 (1982). Mechanism of action: P. Gadher et al., Pestic. Biochem. Physiol. 19, 1 (1983); T. E. Wiggins, B. C. Baldwin, Pestic. Sci. 15, 206 (1984). Resolution of enantiomers by GC: R. S. Burden et al., J. Chromatogr. 391, 273 (1987).
Properties: Odorless, colorless, crystalline solid, mp 147-149°. Vapor pressure at 20°: 1 ´ 10-8 to 2 ´ 10-8 mm Hg. Soly in water at 20°: 9 mg/l. Sol up to 50 g/l in methanol, ethanol, acetone, and chloroform. LD50 in rats (mg/kg): ~4000 orally; >1000 dermally; in mallard ducks: >9000 orally (Bent, Skidmore).
Melting point: mp 147-149°
Toxicity data: LD50 in rats (mg/kg): ~4000 orally; >1000 dermally; in mallard ducks: >9000 orally (Bent, Skidmore)
Use: Agricultural fungicide.
Status: This monograph has been retired and is no longer subject to revision or update.
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